C7 mpg
Instructor
Joined: Jan 2013
Posts: 153
Likes: 74
Best 25 mile average recorded was 41.5 mpg with cruise set @60 mph. Also, did 25 mile average segments with cruise set @ 70 mph and averaged 34.6 mpg in 7th gear & ECO mode.
Over the 2800 miles I have driven the car, I have an average of 22.3 mpg. Believe me, most of these miles were NOT in ECO mode and included many "demonstration" rides!
Over the 2800 miles I have driven the car, I have an average of 22.3 mpg. Believe me, most of these miles were NOT in ECO mode and included many "demonstration" rides!
Last edited by sccaracer46; Dec 12, 2013 at 10:01 AM. Reason: corrected spelling
Burning Brakes
Joined: Jan 2005
Posts: 1,055
Likes: 24
From: Cary NC
Non-Z51, manual transmission. Today I drove some freeway miles at posted speed limits (gasp!). 65 and 70 MPH. About 30 miles each direction. Passenger in the right seat and full fuel tank.
I alternated between gears 6 and 7 as seemed appropriate and kept it in ECO mode. Certainly not trying to hypermile and the roadway had normal wavy elevation changes up and down, but no big hills. Averaged over 30 MPG in both directions. 33.4 one way and 31.8 coming back.
Find me another performance sports car that does that!
I alternated between gears 6 and 7 as seemed appropriate and kept it in ECO mode. Certainly not trying to hypermile and the roadway had normal wavy elevation changes up and down, but no big hills. Averaged over 30 MPG in both directions. 33.4 one way and 31.8 coming back.
Find me another performance sports car that does that!
Drifting
Joined: Jul 2002
Posts: 1,386
Likes: 80
From: NC
Cruise-In IV Veteran
St. Jude Contributor
Are you using a lower octane fuel or possible a fuel with a higher percentage of ethanol?
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Le Mans Master
Joined: Oct 2004
Posts: 5,040
Likes: 416
From: hardyston new jersey
St. Jude Donor '09-'25
Just around 1,000 miles and over all mpg is about 28. That's with an A6 and about 50/50 interstate and around town. Interstate is mostly in Eco mode and around town in Touring. 
Drifting
Joined: Jun 2013
Posts: 1,764
Likes: 10
From: Cumming GA
On order: Torch Red Z51
My 'B' odo has not been changed since delivery (about 4000 miles ago) and is registering 21.1, considering the way I've been driving it and that most of the miles are city and (throttle sprints 
), I'm very happy with that. On the highway tho, my A6 on cruise and level road holds pretty steady around 36mpg at 70 mph. No issues with the mileage, can't wait for a solid trip to really check it.
), I'm very happy with that. On the highway tho, my A6 on cruise and level road holds pretty steady around 36mpg at 70 mph. No issues with the mileage, can't wait for a solid trip to really check it.
Melting Slicks
Joined: Feb 2000
Posts: 3,145
Likes: 537
From: Upland CA
The trip home from BG to California was about 2200 miles. I did not reset "Trip A" and it showed 24.9 MPG with an average speed of 75 MPH when I got home. The first 500 miles were varied speed/RPM for break-in. After the break-in it was mostly Eco mode at 75MPH+. Much of Texas has a posted speed limit of 80MPH and NM and AZ are both 75MPH.
For comparison I went on a 215 mile drive yesterday with about 150 miles of mountain canyons and my average MPG was 18.
For comparison I went on a 215 mile drive yesterday with about 150 miles of mountain canyons and my average MPG was 18.
Drifting
Joined: May 2000
Posts: 1,760
Likes: 115
From: Tennessee
25.9 during the 437 mile drive home, to be fair I did vary the speed some. This is in 7th gear running 75-80MPH in ECO mode. I expect it to get better on the next trip. My old C6Z06 with 600HP would get 25.7 on the road. 
Race Director
Joined: May 2001
Posts: 15,323
Likes: 2,077
From: Guelph, Ontario
So if I were to try that same highway run in a C7 I bet I could easily get over 40 MPG. I suggest those of you who are disappointed with your mileage to try running non ethanol gas if they sell it in your area.
Racer
Joined: Dec 2007
Posts: 289
Likes: 0
From: Fresh Meadows NY
I have 2,600 miles and my average is 19.0 MPG. This is with allot of City driving and also one half day at the road course. Average to work and back is 24 MPG. Best long trip in eco mode was 27 MPG so I also am not getting the type of milage that others are getting but still very impressed
Race Director
Joined: Oct 2013
Posts: 12,967
Likes: 61
Racer
Joined: Oct 2005
Posts: 276
Likes: 0
From: Marietta GA
I have an M7 and I'm not getting the kind of numbers posted here either. But I only use ECO on the expressway, spend very few miles on the expressway and I drive the car. Meaning it's a performance automobile and that's how I drive it. Sure, I'm interested in mpg, but it sure wasn't much of a factor in buying the car and it's pretty much the last thing I take into consideration when I drive it.
Race Director
Joined: Dec 2006
Posts: 12,364
Likes: 2,899
From: Fort Worth, Texas
M7 with non ethanol gas is going to be considerably higher than 10% ethanol and an A6 for those trying to compare results that others are having.
Curious how many are going off the DIC vs calculating at the pump as well if they don't mind stating.
Curious how many are going off the DIC vs calculating at the pump as well if they don't mind stating.