txjeep

I recently bought this C6, but here is what I have seen so far.

Mods: Stock
A6/M6: A6
LS2/LS3: LS3 (2008 coupe)
Driving Mixture (city/hwy): 10/90
Driving Style: Mild
MPG: 24-25 avg (hand calculated, DIC usually shows a little higher)

Mine is a DD/ hwy cruiser. My commute is 50 miles each way. I get on it 2-3 times each way, but most of my time is cruising at 60-70. I have noticed that sitting at a light or stopping here and there to run errands kills the mpg average much more than hard acceleration, so I'm not surprised that you city drivers don't get over 20.

Nosferatu

as the OP I just did another fill up (and this was after a lot of spirited driving). Didn't alter much from my 18.2. Just got 18.0 instead.

Suprpig

Depends on how frisky I get... usually combined 19-22.

TLS_Addict

I must drive like an old granny........my average MPG dropped about 2 from before and after the supercharger.

ButchN

How's this for MPG?
M6 coupe, 5300 miles, cruise set at 65 & was constant for the last 70 or so miles on a 90 mile trip 2 weeks ago & here what I saw at the end of the trip.

Not to shabby considering it also put 389 to the wheels on a Mustang dyno this past week.

FlyerVette

Looks like its time to stop to fill up the tank.....^ Almost new car here and averaging around 21 to 22 with mixed driving.

Quick Silver Z

07 Z06, average = 19.7 mpg

Nosferatu

bumping this instead of starting a new thread.

Just drove 220 miles round trip. 90% of the drive was highway and maybe 20 miles of it city and I only got 25.5mpg. Is that right? Did that small amount of city driving prevent me from seeing something like 28-29mpg? I thought this car could hit 30mpg highway? I was a bit disappointed in the numbers. It's an LS3 M6.

Johnathon59

LS3 Manual, 18 city / 28 highway

Boomer111

MN6, LS3 with LS7 manifolds and tune with 4:10 gearing.

The car averages 22 with mostly highway driving.

25 mpg when crusing 75-80 for a tankful. 28mpg if I keep it at 65 mph at milk it for best economy.

Above off the disc.

stealthy08

My 08 LS3 managed 27 mpg highway, never checked city


I put about 800 miles on my Z06, It actually touched 31 mpg on the 300 mile trip home which is nuts since it is has a cam with a supercharger slapped on it. Haven't checked city mpg yet.