and it's a CORVETTE !!! 
28.9 mpg
Drifting
Joined: Dec 2005
Posts: 1,720
Likes: 3
From: East Hampton CT
Hmm...I wonder what's wrong with my C5 then? I just took a trip to VT last weekend AVERAGING 89mph....there was some ski bum flying along in a maxima at 100+ so I let him stay about a mile up and just tooled along. After a while I figured I was pushing my luck so I slowed back down to ~75. Average from Portland, CT to White River Jct, VT was 23.2 mpg.
On the way home I set the cruise at 75 and it only got 24mpg. I am running in 6th gear....and the car did have a recent tune up and faulty 02 sensor replaced....
Ony thing I can think of is that my tire pressure is around 29psi...which is a little low but I need to wear the outer edges of the tires more since the middle is pretty worn....
Any ideas?
On the way home I set the cruise at 75 and it only got 24mpg. I am running in 6th gear....and the car did have a recent tune up and faulty 02 sensor replaced....
Ony thing I can think of is that my tire pressure is around 29psi...which is a little low but I need to wear the outer edges of the tires more since the middle is pretty worn....
Any ideas?
Burning Brakes
Joined: Jul 2004
Posts: 810
Likes: 0
From: Kennesaw, GA Peach State Posse
Cruise-In VI Veteran
I got 29.9 MPG average according to the DIC driving to Bowling Green last year for Cruise In. I took a picture of it to show people who don't believe Corvettes get great mileage. That was when I still had 2.73 gear though, but it hasn't gone down all that much on highway since I got 3.42 and TC. I run about 2100 RPM instead of 1800 at 70-75
Le Mans Master
Joined: Sep 2004
Posts: 5,118
Likes: 122
From: Madison (Huntsville) Alabama
CI 6-7-8 Veteran
St. Jude Donor '09
I get better mileage on two lane backroads, even hilly ones, than I do with the cruise control set at 75 on the freeway. I suppose it's because I'm driving slower.
Administrator
Joined: Mar 2001
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Likes: 24,734
From: In a parallel universe. Currently own 2014 Stingray Coupe.
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CI 5, 8 & 11 Veteran
That's good MPG out of the car. Mine typically gets 30+ on the open road - right up there with my economy car. 
Instructor
Joined: Oct 2005
Posts: 149
Likes: 1
From: MD
I don't mean to offend anybody but do you all believe what the DIC tells you? 
How many of you have calculated MPG based on what you put in at the pump?
How many of you have calculated MPG based on what you put in at the pump?
Last edited by starshifter; Mar 7, 2006 at 04:43 PM.
Thread Starter
Pro
Joined: Dec 2004
Posts: 503
Likes: 1
From: Belchertown Massachusetts
Originally Posted by Billdog350
Hmm...I wonder what's wrong with my C5 then? I just took a trip to VT last weekend AVERAGING 89mph....there was some ski bum flying along in a maxima at 100+ so I let him stay about a mile up and just tooled along. After a while I figured I was pushing my luck so I slowed back down to ~75. Average from Portland, CT to White River Jct, VT was 23.2 mpg.
On the way home I set the cruise at 75 and it only got 24mpg. I am running in 6th gear....and the car did have a recent tune up and faulty 02 sensor replaced....
Ony thing I can think of is that my tire pressure is around 29psi...which is a little low but I need to wear the outer edges of the tires more since the middle is pretty worn....
Any ideas?
On the way home I set the cruise at 75 and it only got 24mpg. I am running in 6th gear....and the car did have a recent tune up and faulty 02 sensor replaced....
Ony thing I can think of is that my tire pressure is around 29psi...which is a little low but I need to wear the outer edges of the tires more since the middle is pretty worn....
Any ideas?
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Drifting
Joined: Dec 2005
Posts: 1,720
Likes: 3
From: East Hampton CT
Jake, I thought about the hills...but what confused me was how my fuel economy only went up 1 mpg going from 90+ to 75 average....however I didn't reset the avg so maybe that's part of it.
Also, I just started datalogging and I'm adjusting my part throttle (MAF) which already seemed to increase fuel economy just from my trip to work today. Seems that it was running a bit rich (as much as 8%) in the mid range.
Also, I just started datalogging and I'm adjusting my part throttle (MAF) which already seemed to increase fuel economy just from my trip to work today. Seems that it was running a bit rich (as much as 8%) in the mid range.
Thread Starter
Pro
Joined: Dec 2004
Posts: 503
Likes: 1
From: Belchertown Massachusetts
Originally Posted by Billdog350
Jake, I thought about the hills...but what confused me was how my fuel economy only went up 1 mpg going from 90+ to 75 average....however I didn't reset the avg so maybe that's part of it.
Also, I just started datalogging and I'm adjusting my part throttle (MAF) which already seemed to increase fuel economy just from my trip to work today. Seems that it was running a bit rich (as much as 8%) in the mid range.
Also, I just started datalogging and I'm adjusting my part throttle (MAF) which already seemed to increase fuel economy just from my trip to work today. Seems that it was running a bit rich (as much as 8%) in the mid range.
Drifting
Joined: Dec 2005
Posts: 1,720
Likes: 3
From: East Hampton CT
The tune has already netted me a +1 mpg change and looks to be room for more. The Long term fuel trims are still positive. Once I get them closer to zero or slightly negative, I might get back closer to the economy everyone else is getting.
Drifting
Joined: Dec 2005
Posts: 1,720
Likes: 3
From: East Hampton CT
Also, besides terrain there is the "average speed" variable. I think people in flat areas with a nice 15-20 minute highway commute are going to be a lot better off than people like me with 10 min of city driving, then 10 min of highway and then another 5 min of city.