2015 Corvette Z06 To Achieve 23 MPG Highway, 13 MPG City
11-19-2014, 01:55 PM
#1
Advanced
Thread Starter
2015 Corvette Z06 To Achieve 23 MPG Highway, 13 MPG City
This article posted a few hours ago... http://gmauthority.com/blog/2014/11/...y-13-mpg-city/
The article reads as follows:
The 2015 Corvette Stingray can achieve up to 29 MPG on the highway thanks to the gearing of its all-new 8L90E eight-speed automatic transmission. As you may know, that transmission is also destined for use in the 2015 Corvette Z06, which will return equally as impressive highway fuel economy numbers for a 650 horsepower V8 supercar.
According to the U.S. Department of Energy, the 2015 Z06 will return 13 MPG in the city and 23 MPG on the highway for a combined rating of 16 MPG. Those figures are for eight-speed automatic Z06s only, as the figures for seven-speed models are not listed. We’re expecting either improvements of one MPG like seven-speed C7 Stingrays or identical returns with manual Z06s.
The Z06’s fuel economy is comparable to that of other powerful forced-induction V8 cars. The McLaren 650S Coupe’s 3.8-liter twin-turbo V8 and seven-speed dual clutch transmission result in 16 MPG city and 22 MPG highway for a combined rating of 18 MPG, which is only a small improvement over the Z06 considering the engine is smaller and turbocharged. For comparison’s sake, Dodge’s new eight-speed Challenger Hellcat will return 13 MPG city, 22 MPG highway and 16 MPG combined.
The 2015 Z06 benefits from several fuel-saving technologies also implemented on standard C7 Corvette Stingrays including direct injection, Active Fuel Management and continuously variable valve timing. Crucial to its efficiency is Active Fuel Management, which allows it to run as either a four-cylinder with no boost, a V8 with no boost, or a V8 with boost, depending on the levels of performance required at any given time.
Read more: http://gmauthority.com/blog/2014/11/...#ixzz3JXg1UmuN
The article reads as follows:
The 2015 Corvette Stingray can achieve up to 29 MPG on the highway thanks to the gearing of its all-new 8L90E eight-speed automatic transmission. As you may know, that transmission is also destined for use in the 2015 Corvette Z06, which will return equally as impressive highway fuel economy numbers for a 650 horsepower V8 supercar.
According to the U.S. Department of Energy, the 2015 Z06 will return 13 MPG in the city and 23 MPG on the highway for a combined rating of 16 MPG. Those figures are for eight-speed automatic Z06s only, as the figures for seven-speed models are not listed. We’re expecting either improvements of one MPG like seven-speed C7 Stingrays or identical returns with manual Z06s.
The Z06’s fuel economy is comparable to that of other powerful forced-induction V8 cars. The McLaren 650S Coupe’s 3.8-liter twin-turbo V8 and seven-speed dual clutch transmission result in 16 MPG city and 22 MPG highway for a combined rating of 18 MPG, which is only a small improvement over the Z06 considering the engine is smaller and turbocharged. For comparison’s sake, Dodge’s new eight-speed Challenger Hellcat will return 13 MPG city, 22 MPG highway and 16 MPG combined.
The 2015 Z06 benefits from several fuel-saving technologies also implemented on standard C7 Corvette Stingrays including direct injection, Active Fuel Management and continuously variable valve timing. Crucial to its efficiency is Active Fuel Management, which allows it to run as either a four-cylinder with no boost, a V8 with no boost, or a V8 with boost, depending on the levels of performance required at any given time.
Read more: http://gmauthority.com/blog/2014/11/...#ixzz3JXg1UmuN
11-19-2014, 02:31 PM
#2
Safety Car
Maybe you could edit the thread title to clarify that this is A8 and not M7?
We have already seen that the A8 is subject to the gas guzzler tax. What we are wondering about is the manual transmission.
We have already seen that the A8 is subject to the gas guzzler tax. What we are wondering about is the manual transmission.
Last edited by CaryBob; 11-19-2014 at 02:34 PM.
11-19-2014, 02:48 PM
#3
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Member Since: Jun 2014
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It's so ridiculous that the Z06 gets the same mpg as the Hellcat. It's much lighter, more aerodynamic, has less hp, and incorporates all the fuel savings tech. What the hell?
11-19-2014, 03:11 PM
#6
Le Mans Master
"EPA conducts fuel economy tests in a laboratory on a dynamometer (a device similar to a treadmill). Laboratory conditions can be different from real world conditions for such parameters as vehicle speeds, acceleration rates, driving patterns, ambient temperatures, fuel type, tire pressure, wind resistance, etc. EPA studies indicate that vehicles driven by typical drivers under typical road conditions get approximately 70 to 90 percent of the laboratory test-based city miles per gallon (mpg) value and approximately 70 to 80 percent of laboratory highway mpg value. This difference is referred to as “in-use shortfall.” To account for the in-use shortfall, the city and highway mpg values listed in Fuel Economy Guide and shown on fuel economy labels are based on fuel economy test results of the city and highway tests plus three additional
tests. The three additional tests measure fuel economy 1) at cold ambient temperatures, 2) at warmer temperatures with the air conditioner running, and 3) when operated at high speeds and high acceleration rates. However, the combined city and highway fuel economy that is used to determine tax liability is not adjusted to account for in-use shortfall, so it is higher than the mpg values provided in the Fuel Economy Guide (www.fueleconomy.gov) and posted on the window stickers of new vehicles."
tests. The three additional tests measure fuel economy 1) at cold ambient temperatures, 2) at warmer temperatures with the air conditioner running, and 3) when operated at high speeds and high acceleration rates. However, the combined city and highway fuel economy that is used to determine tax liability is not adjusted to account for in-use shortfall, so it is higher than the mpg values provided in the Fuel Economy Guide (www.fueleconomy.gov) and posted on the window stickers of new vehicles."
Last edited by BOBSZ06; 09-11-2015 at 09:53 AM.
11-19-2014, 03:15 PM
#7
Instructor
What doesn't jive are those zero mile photos from the buyers tour which appear to show the car in Eco mode. Wonder if GM made the change to default to Eco to get better fuel economy numbers?
Since it's so easy to change modes I would hope GM would do so to save me a little GGT money.
11-19-2014, 03:41 PM
#8
This article posted a few hours ago... http://gmauthority.com/blog/2014/11/...y-13-mpg-city/
The article reads as follows:
The 2015 Corvette Stingray can achieve up to 29 MPG on the highway thanks to the gearing of its all-new 8L90E eight-speed automatic transmission. As you may know, that transmission is also destined for use in the 2015 Corvette Z06, which will return equally as impressive highway fuel economy numbers for a 650 horsepower V8 supercar.
According to the U.S. Department of Energy, the 2015 Z06 will return 13 MPG in the city and 23 MPG on the highway for a combined rating of 16 MPG. Those figures are for eight-speed automatic Z06s only, as the figures for seven-speed models are not listed. We’re expecting either improvements of one MPG like seven-speed C7 Stingrays or identical returns with manual Z06s.
The Z06’s fuel economy is comparable to that of other powerful forced-induction V8 cars. The McLaren 650S Coupe’s 3.8-liter twin-turbo V8 and seven-speed dual clutch transmission result in 16 MPG city and 22 MPG highway for a combined rating of 18 MPG, which is only a small improvement over the Z06 considering the engine is smaller and turbocharged. For comparison’s sake, Dodge’s new eight-speed Challenger Hellcat will return 13 MPG city, 22 MPG highway and 16 MPG combined.
The 2015 Z06 benefits from several fuel-saving technologies also implemented on standard C7 Corvette Stingrays including direct injection, Active Fuel Management and continuously variable valve timing. Crucial to its efficiency is Active Fuel Management, which allows it to run as either a four-cylinder with no boost, a V8 with no boost, or a V8 with boost, depending on the levels of performance required at any given time.
Read more: http://gmauthority.com/blog/2014/11/...#ixzz3JXg1UmuN
The article reads as follows:
The 2015 Corvette Stingray can achieve up to 29 MPG on the highway thanks to the gearing of its all-new 8L90E eight-speed automatic transmission. As you may know, that transmission is also destined for use in the 2015 Corvette Z06, which will return equally as impressive highway fuel economy numbers for a 650 horsepower V8 supercar.
According to the U.S. Department of Energy, the 2015 Z06 will return 13 MPG in the city and 23 MPG on the highway for a combined rating of 16 MPG. Those figures are for eight-speed automatic Z06s only, as the figures for seven-speed models are not listed. We’re expecting either improvements of one MPG like seven-speed C7 Stingrays or identical returns with manual Z06s.
The Z06’s fuel economy is comparable to that of other powerful forced-induction V8 cars. The McLaren 650S Coupe’s 3.8-liter twin-turbo V8 and seven-speed dual clutch transmission result in 16 MPG city and 22 MPG highway for a combined rating of 18 MPG, which is only a small improvement over the Z06 considering the engine is smaller and turbocharged. For comparison’s sake, Dodge’s new eight-speed Challenger Hellcat will return 13 MPG city, 22 MPG highway and 16 MPG combined.
The 2015 Z06 benefits from several fuel-saving technologies also implemented on standard C7 Corvette Stingrays including direct injection, Active Fuel Management and continuously variable valve timing. Crucial to its efficiency is Active Fuel Management, which allows it to run as either a four-cylinder with no boost, a V8 with no boost, or a V8 with boost, depending on the levels of performance required at any given time.
Read more: http://gmauthority.com/blog/2014/11/...#ixzz3JXg1UmuN
11-19-2014, 03:47 PM
#9
Pro
This article posted a few hours ago... http://gmauthority.com/blog/2014/11/...y-13-mpg-city/
The article reads as follows:
The 2015 Corvette Stingray can achieve up to 29 MPG on the highway thanks to the gearing of its all-new 8L90E eight-speed automatic transmission. As you may know, that transmission is also destined for use in the 2015 Corvette Z06, which will return equally as impressive highway fuel economy numbers for a 650 horsepower V8 supercar.
According to the U.S. Department of Energy, the 2015 Z06 will return 13 MPG in the city and 23 MPG on the highway for a combined rating of 16 MPG. Those figures are for eight-speed automatic Z06s only, as the figures for seven-speed models are not listed. We’re expecting either improvements of one MPG like seven-speed C7 Stingrays or identical returns with manual Z06s.
The Z06’s fuel economy is comparable to that of other powerful forced-induction V8 cars. The McLaren 650S Coupe’s 3.8-liter twin-turbo V8 and seven-speed dual clutch transmission result in 16 MPG city and 22 MPG highway for a combined rating of 18 MPG, which is only a small improvement over the Z06 considering the engine is smaller and turbocharged. For comparison’s sake, Dodge’s new eight-speed Challenger Hellcat will return 13 MPG city, 22 MPG highway and 16 MPG combined.
The 2015 Z06 benefits from several fuel-saving technologies also implemented on standard C7 Corvette Stingrays including direct injection, Active Fuel Management and continuously variable valve timing. Crucial to its efficiency is Active Fuel Management, which allows it to run as either a four-cylinder with no boost, a V8 with no boost, or a V8 with boost, depending on the levels of performance required at any given time.
Read more: http://gmauthority.com/blog/2014/11/...#ixzz3JXg1UmuN
The article reads as follows:
The 2015 Corvette Stingray can achieve up to 29 MPG on the highway thanks to the gearing of its all-new 8L90E eight-speed automatic transmission. As you may know, that transmission is also destined for use in the 2015 Corvette Z06, which will return equally as impressive highway fuel economy numbers for a 650 horsepower V8 supercar.
According to the U.S. Department of Energy, the 2015 Z06 will return 13 MPG in the city and 23 MPG on the highway for a combined rating of 16 MPG. Those figures are for eight-speed automatic Z06s only, as the figures for seven-speed models are not listed. We’re expecting either improvements of one MPG like seven-speed C7 Stingrays or identical returns with manual Z06s.
The Z06’s fuel economy is comparable to that of other powerful forced-induction V8 cars. The McLaren 650S Coupe’s 3.8-liter twin-turbo V8 and seven-speed dual clutch transmission result in 16 MPG city and 22 MPG highway for a combined rating of 18 MPG, which is only a small improvement over the Z06 considering the engine is smaller and turbocharged. For comparison’s sake, Dodge’s new eight-speed Challenger Hellcat will return 13 MPG city, 22 MPG highway and 16 MPG combined.
The 2015 Z06 benefits from several fuel-saving technologies also implemented on standard C7 Corvette Stingrays including direct injection, Active Fuel Management and continuously variable valve timing. Crucial to its efficiency is Active Fuel Management, which allows it to run as either a four-cylinder with no boost, a V8 with no boost, or a V8 with boost, depending on the levels of performance required at any given time.
Read more: http://gmauthority.com/blog/2014/11/...#ixzz3JXg1UmuN
11-19-2014, 03:59 PM
#10
This article posted a few hours ago... http://gmauthority.com/blog/2014/11/...y-13-mpg-city/
The article reads as follows:
The 2015 Corvette Stingray can achieve up to 29 MPG on the highway thanks to the gearing of its all-new 8L90E eight-speed automatic transmission. As you may know, that transmission is also destined for use in the 2015 Corvette Z06, which will return equally as impressive highway fuel economy numbers for a 650 horsepower V8 supercar.
According to the U.S. Department of Energy, the 2015 Z06 will return 13 MPG in the city and 23 MPG on the highway for a combined rating of 16 MPG. Those figures are for eight-speed automatic Z06s only, as the figures for seven-speed models are not listed. We’re expecting either improvements of one MPG like seven-speed C7 Stingrays or identical returns with manual Z06s.
The Z06’s fuel economy is comparable to that of other powerful forced-induction V8 cars. The McLaren 650S Coupe’s 3.8-liter twin-turbo V8 and seven-speed dual clutch transmission result in 16 MPG city and 22 MPG highway for a combined rating of 18 MPG, which is only a small improvement over the Z06 considering the engine is smaller and turbocharged. For comparison’s sake, Dodge’s new eight-speed Challenger Hellcat will return 13 MPG city, 22 MPG highway and 16 MPG combined.
The 2015 Z06 benefits from several fuel-saving technologies also implemented on standard C7 Corvette Stingrays including direct injection, Active Fuel Management and continuously variable valve timing. Crucial to its efficiency is Active Fuel Management, which allows it to run as either a four-cylinder with no boost, a V8 with no boost, or a V8 with boost, depending on the levels of performance required at any given time.
Read more: http://gmauthority.com/blog/2014/11/...#ixzz3JXg1UmuN
The article reads as follows:
The 2015 Corvette Stingray can achieve up to 29 MPG on the highway thanks to the gearing of its all-new 8L90E eight-speed automatic transmission. As you may know, that transmission is also destined for use in the 2015 Corvette Z06, which will return equally as impressive highway fuel economy numbers for a 650 horsepower V8 supercar.
According to the U.S. Department of Energy, the 2015 Z06 will return 13 MPG in the city and 23 MPG on the highway for a combined rating of 16 MPG. Those figures are for eight-speed automatic Z06s only, as the figures for seven-speed models are not listed. We’re expecting either improvements of one MPG like seven-speed C7 Stingrays or identical returns with manual Z06s.
The Z06’s fuel economy is comparable to that of other powerful forced-induction V8 cars. The McLaren 650S Coupe’s 3.8-liter twin-turbo V8 and seven-speed dual clutch transmission result in 16 MPG city and 22 MPG highway for a combined rating of 18 MPG, which is only a small improvement over the Z06 considering the engine is smaller and turbocharged. For comparison’s sake, Dodge’s new eight-speed Challenger Hellcat will return 13 MPG city, 22 MPG highway and 16 MPG combined.
The 2015 Z06 benefits from several fuel-saving technologies also implemented on standard C7 Corvette Stingrays including direct injection, Active Fuel Management and continuously variable valve timing. Crucial to its efficiency is Active Fuel Management, which allows it to run as either a four-cylinder with no boost, a V8 with no boost, or a V8 with boost, depending on the levels of performance required at any given time.
Read more: http://gmauthority.com/blog/2014/11/...#ixzz3JXg1UmuN
Last edited by dar02081961; 11-19-2014 at 04:02 PM.
11-19-2014, 05:23 PM
#11
Safety Car
I believe the numbers. Why not? There is a lot more to it than people make it seem.
1. Gearing is more aggressive
2. Camshaft profile is more aggresive
3. Superchargers, even bypassed, do not offer the flow pattern of the composite intake manifold
4. AFM does not kick in default setting so it may not be tested with AFM at all
5. Rolling resistance of new stickier tires
6. More downforce than before
and so on and so on.
1. Gearing is more aggressive
2. Camshaft profile is more aggresive
3. Superchargers, even bypassed, do not offer the flow pattern of the composite intake manifold
4. AFM does not kick in default setting so it may not be tested with AFM at all
5. Rolling resistance of new stickier tires
6. More downforce than before
and so on and so on.
11-19-2014, 05:32 PM
#12
Racer
11-19-2014, 05:53 PM
#13
Melting Slicks
This is how the EPA tested the new Z06, that would explain the gas mileage
http://www.corvettevideos.tv/chevrol...acing-footage/
http://www.corvettevideos.tv/chevrol...acing-footage/
Last edited by fasttoys; 11-19-2014 at 11:31 PM.
11-19-2014, 06:20 PM
#14
I believe the numbers. Why not? There is a lot more to it than people make it seem.
1. Gearing is more aggressive
2. Camshaft profile is more aggresive
3. Superchargers, even bypassed, do not offer the flow pattern of the composite intake manifold
4. AFM does not kick in default setting so it may not be tested with AFM at all
5. Rolling resistance of new stickier tires
6. More downforce than before
and so on and so on.
1. Gearing is more aggressive
2. Camshaft profile is more aggresive
3. Superchargers, even bypassed, do not offer the flow pattern of the composite intake manifold
4. AFM does not kick in default setting so it may not be tested with AFM at all
5. Rolling resistance of new stickier tires
6. More downforce than before
and so on and so on.
2. We don’t know the camshaft profile, but generally OEM supercharged engines compared to the NA counterparts have less aggressive cams because less overlap is required.
3. The supercharger isn’t bypassed it’s just not turning fast enough to produce much boost and therefore not causing much parasitic drag either. I won’t get into flow characteristics of manifolds but you may have a point here. However the difference should be minimal for low RPMs where flow is more than sufficient for either design.
4. AFM wasn’t included in our discussion for either car. Because it isn’t the default mode, the EPA doesn’t allow it to be used in the test.
5. Possibly some losses here.
6. Probably, but the down force (drag) created by this car at EPA test speeds shouldn’t be that much higher. And could possibly be lower but that’s another whole discussion. But let’s say it is much higher than the C7, do you think the Z06 has more drag than a Hellcat? If not how do you account for a Hellcat having better MPG numbers?
I am not saying the final numbers are wrong, I am saying they don’t add up based on what we know. I agree with you, there must be a lot more to it than we are being told.
11-19-2014, 07:20 PM
#15
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Location: Northern VA
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My assumption is that they didn't submit the Z07 to the EPA for testing, so rolling resistance from the tires shouldn't be dramatically more than that of the Stingray. If they did submit the Z07, then the down force will bite them in the ***. It can be felt in speeds as low as 55MPH. As in the driver can tell it's acting on the car. But even with the Stage 1 aero, the slipperiness of the car will be somewhat lower than the Stingray.
11-19-2014, 07:33 PM
#16
The A:F ratio of the LT4 is probably less efficient than that of the LT1 from a fuel savings perspective. Perhaps like the LS9 (and LSA) before it, the LT4 could be dumping some small amount of unburned fuel right into the exhaust due to how rich GM's likely got the engine tuned. That will eat into the numbers.
11-19-2014, 08:32 PM
#19
Melting Slicks
Yea I have read this and several other articles reporting the same EPA numbers. I am having trouble accepting these numbers though. Especially when you compare the Z06 to the Hellcat. 1000lbs lighter, more aerodynamic, smaller engine, smaller less parisitic supercharger, and as others have posted a host of fuel saving technologies like varible valve timing and cylinder deactivation. Sounds like BS to me, or maybe the Hellcat has managed to do something thats not been done before......transcend the laws of physics.
WTF Chebby!?!???
11-19-2014, 10:02 PM
#20
Le Mans Master
Member Since: Dec 2004
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St. Jude Donor '06-'08-'10-'11-'12-'13 '14-'15-'16-'17-'18-'19
I know that my 2008 Z06 got 28 MPG highway as long as I kept my foot out of it. With all the talk GM put out about weight savings, A8 gas saving tranny, AFM, and then to come out with these ratings is very surprising and disappointing. I would have expected 25 MPG highway minimum. I mean really, if it's that bad, why even bother to build AFM in if it isn't used to do the EPA numbers? What did it get them?