Mpg
#21
Race Director
Member Since: Mar 2010
Location: T-Town WA
Posts: 15,101
Received 3,629 Likes
on
2,349 Posts
2016 C6 of Year Finalist
I have made many 1500+ mile trips and cruise at 16-1700 in 6th all day. If I'm in hilly terrain I will run in the 18-2000 bracket...or more if conditions require. If I need to press hard on the foot feed I want some RPM's up before I start.
#22
Le Mans Master
- RPM's MPG's & MPH are all closely related measures. And you are correct that at 70 mph you are below a 2000 rpm threshold. That's my concern. As a first time owner, I have been concerned about keeping the rpm's at or near 2000 for the optimal treatment of the engine, not so much concerned about mph. If you are really going to enjoy this vehicle then you need to feed it the fuel required. You could feed it lower octane fuel to save money but performance will suffer. Maybe that's a topic for another discussion. My concern here is with an emphasis on rpms.
#23
Race Director
We have a mountain pass just east of Salt Lake City called Parley's Summit. It goes from 4300 to around 8400 feet in elevation. My 13 GS with Auto will maintain 6th gear at around the speed limit with the engine around 1700 rpm. It has no trouble maintaining that speed or even increasing it without shifting down. Of course more throttle means it will shift down and you will accelerate without a problem. C6 just does not care about hills.
Even our 18 Equinox that has a 4 banger turbo may shift down to 8th gear (from 9th), also 7th at times. It doesn't feel like it is lugging. I had a 12 Chrysler 300 Hemi AWD before and cruising at 75 mph was around 2300 rpm.
I don't worry about MPG with the Vette but cruising at 80ish around here in Utah will net about 22-23 MPG. I have pushed it hard before when out with some "exotic" cars and the Italian cars needed to fill up with gas twice as much.
Even our 18 Equinox that has a 4 banger turbo may shift down to 8th gear (from 9th), also 7th at times. It doesn't feel like it is lugging. I had a 12 Chrysler 300 Hemi AWD before and cruising at 75 mph was around 2300 rpm.
I don't worry about MPG with the Vette but cruising at 80ish around here in Utah will net about 22-23 MPG. I have pushed it hard before when out with some "exotic" cars and the Italian cars needed to fill up with gas twice as much.
#24
Team Owner
My C6s usually averaged about 27 MPG at 75-77 MPH on the interstate for about 55 miles between Nashville and Manchester. 14-15 MPG in town with a moderate amount of stop-n-go traffic.
#26
Advanced
I'm averaging around 16.5 mpg in my 2008 six-speed with a commute that is at least 50% highway. I suppose I like to hear the engine too much or something. While I'm sure I could average over 20 mpg, I wouldn't like driving the car and would sell it.
#27
Drifting
Member Since: Feb 2017
Location: Covington KY
Posts: 1,593
Received 596 Likes
on
393 Posts
2022 C6 of the Year Finalist - Unmodified
'05 LS2 Z51 M6 currently registering 19.3 mpg in combined city/highway driving but more in the city. I have a Cobalt 4 banger that is my daily on mostly the same roads and it is averaging a little under 24 mpg, which one would you rather drive? I'll take the 'vette! And can't you just listen to the engine and tell when it is winding out, lugging down or in the sweet spot, it's not rocket science.
#28
Burning Brakes
I have taken mine on a few longer drives. I have found that, and this does not make sense at first, I get better mileage at 80mph than 75mph. At 75mph i'm seeing about 1800 rpm and at 80 I see about 2000 rpm. The best I can figure is that is has something to do with the torque / HP power curve and that just that little bump in RMP gets it into a slight better range and the engine/drive trail runs more economically.
#29
Instructor
Member Since: Feb 2011
Location: Tacoma Washington
Posts: 108
Likes: 0
Received 0 Likes
on
0 Posts
Just drove from Pocatello Idaho to Tacoma Washington straight for 12 hours and got 29.9 miles to the gallon with a max speed in Idaho of around 85 and a low in Washington of around 65.
Many places in the middle with construction and fires to slow me down in some areas to around 40-45.
all in all I was very pleased with the results.
2007 convertible with top up all the way home.
Also just FYI I just bought this car and drove it home.
Many places in the middle with construction and fires to slow me down in some areas to around 40-45.
all in all I was very pleased with the results.
2007 convertible with top up all the way home.
Also just FYI I just bought this car and drove it home.
#30
Seriously.
I wish I got 16mpg. My commute is about 50/50 highway/city and I'm getting an average of 10.9mpg on this tank (usually hovers between 9-12). Every drive for me is a spirited drive, though. I bought this car for a reason, ya know. '08 mn6 ls3 supercharged but otherwise stock.
#31
Race Director
If you're worried about gas mileage, you bought the wrong car. As far as RPM's go these cars red line at 6500 RPM. Stay under that and you'll be good.
The following users liked this post:
Jstan2014 (07-30-2018)
#33
I think they were trying to ask if it was hard on your engine to go too slow in any given gear. Back in the day we would call it lugging the motor.......or something like that. I think the only people that have to worry about it these days are the owners of harleys big twins....lOL
#34
Le Mans Master
Member Since: Oct 2005
Location: Left Coast, San Diego
Posts: 6,654
Received 2,093 Likes
on
1,207 Posts
As I have stated in the past, I hate it when I accidently log into a Prius forum.
Last edited by Vet Interested; 07-30-2018 at 04:09 PM.
The following 2 users liked this post by Vet Interested:
Bruze (07-30-2018),
marinablu67 (07-30-2018)
#35
Drifting
The following users liked this post:
marinablu67 (07-30-2018)
#38
6th Gear
Thread Starter
Member Since: Jul 2015
Location: New Palestine Indiana
Posts: 6
Likes: 0
Received 0 Likes
on
0 Posts
OK, OK, let's see if I can clarify my question. It should be apparent that a Corvette is not generally purchased or even designed with mpg in mind. It is, however, capable of obtaining some pretty remarkable numbers. In order to achieve those numbers, I would suspect that the car is being driven with some pretty low rpm's. I question if driving to obtain those remarkable numbers might be harmful. Let's visualize for a moment that you are driving around town at 40 - 45 mph. I normally try to keep the rpm's around 2000 rpms. Perhaps a little less but certainly not much as it feels like it might be lugging the engine. Cruising at interstate speeds I can see holding rpm's a little less than 2000 because you are often not accelerating or making demands on the engine. Forget mpg, what is the best technique for the car? Automatics don't worry about these issues but those of us with sticks have greater control and more responsibility for driving correctly. I am looking for reasoned opinions.
#39
Pro
I don't think they ran the RPMs dangerously low just to get a little better mileage. Manual transmission cars have always used slightly less gas than automatics because no power is lost in the torque converter. If you drive a C6 automatic, you will notice it shifts through the gears to the highest gear possible without wasting any time. The automatics actually keep the RPMs too low around town - in my opinion. If you need to accelerate very much, it has to shift down 3 gears. Unless you feel the engine bucking or shaking under load, you are not lugging it. These engines will take a tremendous beating and still last a long time. I purposely tried to tear up 350 V8 in my 78 chevy truck and it just kept going.
Last edited by montman; 07-31-2018 at 01:52 PM.
#40
OK, OK, let's see if I can clarify my question. It should be apparent that a Corvette is not generally purchased or even designed with mpg in mind. It is, however, capable of obtaining some pretty remarkable numbers. In order to achieve those numbers, I would suspect that the car is being driven with some pretty low rpm's. I question if driving to obtain those remarkable numbers might be harmful. Let's visualize for a moment that you are driving around town at 40 - 45 mph. I normally try to keep the rpm's around 2000 rpms. Perhaps a little less but certainly not much as it feels like it might be lugging the engine. Cruising at interstate speeds I can see holding rpm's a little less than 2000 because you are often not accelerating or making demands on the engine. Forget mpg, what is the best technique for the car? Automatics don't worry about these issues but those of us with sticks have greater control and more responsibility for driving correctly. I am looking for reasoned opinions.