MPG On your C5?
Le Mans Master
Joined: Oct 2010
Posts: 7,373
Likes: 1,128
From: cold & windy
Safety Car
Joined: Jul 2010
Posts: 3,992
Likes: 386
From: Chandler AZ
The C5 gets pretty damned good mpg, but, what if you were to swap a LS1-LS2-LS3 engine (heck even a LS7 might get decent mpg!) and a T56 in your C3, it might get pretty good mpg as well, with the right rear gears, heck even a auto might not be too bad.
I have a 1965 Chevy truck with a 396 big block, and TH400, plans are to put a LS1 or Vortec (truck version of the LS1) and 4L60-E trans.
The truck now at 60 mph on the freeway driving very careful gets 13.8 mpg, hopefully with a 5.3 or LS1 and overdrive it could hit 20 mpg!
I have a 1965 Chevy truck with a 396 big block, and TH400, plans are to put a LS1 or Vortec (truck version of the LS1) and 4L60-E trans.
The truck now at 60 mph on the freeway driving very careful gets 13.8 mpg, hopefully with a 5.3 or LS1 and overdrive it could hit 20 mpg!
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Verdad Gallardo
Team Owner
Joined: Mar 2006
Posts: 27,567
Likes: 99
From: San Diego
My A4 with 2.73 gears got 17-18 around town, and 27 on the freeway.
My Mn6 with 3.42 gears and a supercharger got 13-14 around town, and 26 on the freeway.
My Mn6 with 3.90 Gears, 402 and a blower gets 8-10 around town, and 20-22 on the freeway. But she is easily the most fun I've ever had with my clothes on.
My Mn6 with 3.42 gears and a supercharger got 13-14 around town, and 26 on the freeway.
My Mn6 with 3.90 Gears, 402 and a blower gets 8-10 around town, and 20-22 on the freeway. But she is easily the most fun I've ever had with my clothes on.
Le Mans Master
Joined: Jan 2004
Posts: 9,488
Likes: 1,743
From: Knoxville Tn
Maybe if the trip is downhill all the way.
The best I've ever gotten is 30 on trips over an hour.
then again, 30 ain't all bad...
Instructor
Joined: Aug 2008
Posts: 147
Likes: 1
From: Nazareth PA
Started a daily round trip of 130mi a day 3 yrs ago when I bought my 04' C5 M6. One of the best purchases I ever made
I restart the MPG counter every spring for the full years driving,
85% highway 15% city and every year it ends up averaging around 26mpg and I don't drive in the slow lane
Would say it does about 30+mpg on the highway doing 80mph as much as possible.
So far its doing as good as my '12 Sonata that's supposed to be getting 35mpg
I would buy a low milage one in a heartbeat!
I restart the MPG counter every spring for the full years driving,
85% highway 15% city and every year it ends up averaging around 26mpg and I don't drive in the slow lane
Would say it does about 30+mpg on the highway doing 80mph as much as possible.So far its doing as good as my '12 Sonata that's supposed to be getting 35mpg
I would buy a low milage one in a heartbeat!
Burning Brakes
Joined: Sep 2011
Posts: 764
Likes: 19
From: odessa FL
01 M6 would average 25 and 31-33 on highway runs if I kept the throttle gentle. I also once tried to see what max mpg I could sustain. It would hold in the 41-43 range in 6th at 58 mph, air off windows up and obviously, being in flat Florida helps. Able to average 41 over 10 miles, but that may not be that acurate of course. You wouldnt want to lug it that way all the time. Point is, the milage is fantastic for what they are!
Recently added STS turbos and 60# injectors. Mileage displayed has gone up actually, but waiting to calculate it the old fashioned way to confirm that.
Recently added STS turbos and 60# injectors. Mileage displayed has gone up actually, but waiting to calculate it the old fashioned way to confirm that.
Team Owner
Joined: Mar 2006
Posts: 27,567
Likes: 99
From: San Diego
01 M6 would average 25 and 31-33 on highway runs if I kept the throttle gentle. I also once tried to see what max mpg I could sustain. It would hold in the 41-43 range in 6th at 58 mph, air off windows up and obviously, being in flat Florida helps. Able to average 41 over 10 miles, but that may not be that acurate of course. You wouldnt want to lug it that way all the time. Point is, the milage is fantastic for what they are!
Recently added STS turbos and 60# injectors. Mileage displayed has gone up actually, but waiting to calculate it the old fashioned way to confirm that.
Recently added STS turbos and 60# injectors. Mileage displayed has gone up actually, but waiting to calculate it the old fashioned way to confirm that.
Melting Slicks
Joined: Jun 2010
Posts: 2,809
Likes: 3
From: Yorktown Virginia
Mine is off by 1.5-2 mpg and its stock besides the headers.