Average MPG?
Le Mans Master
Joined: Feb 2007
Posts: 8,514
Likes: 235
From: Currently somewhere in IL,IN,KY,TN,MO,AR,MS,AL, or FL
Last week I drove 1,700 miles and got just over 28mpg at 75-80. The secret to high mileage is ALWAYS be on cruise control in 6th gear and step on the gas before you step on the brake. Accelerating around a situation uses less gas than slowing down.
Safety Car
Joined: Nov 2010
Posts: 3,787
Likes: 9
From: La Marque, Texas
Posted this about my 09 w/z51 awhile back. Since then I drove another trip of about ~300 miles and got 22mpg but then recently drove ~875 miles on a trip which was all hiway and kept the speeds between 70-80 all the way and got 25.5mpg. Really not bad for a 400+ hp beast. I only get 29.5mpg hiway in my 4 cyl Nissan Altima. That kinda keeps it in perspective for me.
Racer
Joined: Jan 2011
Posts: 299
Likes: 2
From: Canyon Lake TX
The best I have gotten on a trip was 27.4, and I have averaged 21.4 over the last 10,000 miles, or so. I keep pretty close tabs on my mileage with an iPod app, and it doesn't match my DIC average. It has been suggested that the 10% Ethanol, that I usually put in it, could be part of the reason. I am still happy with my mileage. It sure beats the mileage I get in the truck!
Race Director
Joined: Dec 2007
Posts: 19,574
Likes: 167
From: Frederick, MD
The best I have gotten on a trip was 27.4, and I have averaged 21.4 over the last 10,000 miles, or so. I keep pretty close tabs on my mileage with an iPod app, and it doesn't match my DIC average. It has been suggested that the 10% Ethanol, that I usually put in it, could be part of the reason. I am still happy with my mileage. It sure beats the mileage I get in the truck!
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Drifting
Joined: Mar 2011
Posts: 1,564
Likes: 31
From: Land O' Lakes/Tampa Florida
St. Jude Donor '12-'13-'14
Heel & Toe
Joined: Nov 2011
Posts: 20
Likes: 0
From: Houston Texas
07 manual as well (LS2) round trip apprx 400 miles 75 - 80 on cruise only breaking off to 70 when receiving the dreaded bogie hits on radar.
First car I've owned that's lived up the quoted mpg on the sticker (18/28) I believe.
Le Mans Master
Joined: Jan 2002
Posts: 5,890
Likes: 1,198
From: Ft. Myers FL
Drove 2600 miles to Ft. Myers and back to SE PA last year and averaged 29.3. Took the drive to move down here , 1300 miles, last month and averaged 28.6. The big difference.....every gas station now is a least 10% ethanol. 
But, that's still not bad for a car that averages 21-23 in the city and turns in the low 12's. 
But, that's still not bad for a car that averages 21-23 in the city and turns in the low 12's.
Team Owner
Joined: Sep 2000
Posts: 25,004
Likes: 2,706
From: Far NW 'burbs of Chicago
St. Jude Donor '13
Pro
Joined: Jul 2014
Posts: 642
Likes: 11
92 C4 auto.>>>>>>>>just took a 136 mile cruze on the freeway 60mph CC on and got 26 MPG....then again my geo metro gets 45! hey maybe I can put a vette body on a geo frame
Last edited by lectroglide; Aug 24, 2014 at 11:28 PM.
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 22ish "around town", which is really suburban driving with relatively short trips. I've gotten as high as 30 on two lane highways with speed limit of 55, driving 65-70. And it's in the upper 20s on a strictly freeway trip driving around 75. My car has Z51 with A6, which has a somewhat peppier, and therefore less energy efficient, rear end.
Safety Car
Joined: Dec 2011
Posts: 3,608
Likes: 13
From: New Rochelle N.Y. 2013 Grand Sport
Race Director
Joined: May 2001
Posts: 15,323
Likes: 2,077
From: Guelph, Ontario
This is my best highway mileage on my C6:
I know it sounds unbelievable, but this was done last summer running non ethanol gas from Costco, on a perfectly flat highway run for one full hour at 60mph, with about 5 minutes where I had to slow down to 50 mph for construction. It was not downhill and there was no tailwind (but no headwind either) I had the air conditioning off and the windows open (and the roof was on) In mixed driving, as long as I don't get stuck in any massive traffic jams, I can average close to 25 MPG. This is according to the DIC, although I have compared a full tank of hand calculation MPG once and found it to be exactly on the money with what my DIC said (on that particular tankful it happened to be 22.3 MPG)
I know these cars weren't meant to be driven this way, but it's nice to know that they can achieve this kind of gas mileage and still be able to run low 12s in the quarter mile. I'm anxious to see what I could do with a C7, as I know it's capable of even better mileage with it's cylinder shutdown technology and taller overall gearing (on the non Z51 manual cars anyhow)
I know it sounds unbelievable, but this was done last summer running non ethanol gas from Costco, on a perfectly flat highway run for one full hour at 60mph, with about 5 minutes where I had to slow down to 50 mph for construction. It was not downhill and there was no tailwind (but no headwind either) I had the air conditioning off and the windows open (and the roof was on) In mixed driving, as long as I don't get stuck in any massive traffic jams, I can average close to 25 MPG. This is according to the DIC, although I have compared a full tank of hand calculation MPG once and found it to be exactly on the money with what my DIC said (on that particular tankful it happened to be 22.3 MPG)
I know these cars weren't meant to be driven this way, but it's nice to know that they can achieve this kind of gas mileage and still be able to run low 12s in the quarter mile. I'm anxious to see what I could do with a C7, as I know it's capable of even better mileage with it's cylinder shutdown technology and taller overall gearing (on the non Z51 manual cars anyhow)
Pro
Joined: Feb 2012
Posts: 746
Likes: 15
Two weeks ago I was up in the San Juan Islands for the weekend. Upon my return to Portland after topping up at the Burlington, Washington Costco I was reading 31.8 mpg on the information display. I did stop at Southcenter Mall to stretch my legs, but was otherwise moving at a steady pace. Cruise was set no higher than 76 mph (Posted Limit was 70 mph). When going through Seattle to Olympia cruise was set to 65 mph with some slow downs in traffic congestion.
I had a very hard time not opening up the throttle on this trip, but made it through OK
It's amazing how these cars can sip gas if you just let them. And how thirsty they can be if you open them up.
I had a very hard time not opening up the throttle on this trip, but made it through OK
It's amazing how these cars can sip gas if you just let them. And how thirsty they can be if you open them up.