Pontiac G8 2008-09 & Chevrolet SS 2014+ LSX based RWD 4-door sedans

Gas Miliage on GT

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Old 08-07-2011, 01:00 PM
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Originally Posted by johnbell2
Dyno sheet, the bottom line is stock tune with CAI installed. Full stock baseline was 294 rwhp / 313 rwtq:
A stock G8 GT with 361HP only puts down 294RWHP? That's about the same as a stock LS1.

This is good news for my race against one of my friends who owns a G8 Gt!
Old 08-07-2011, 02:55 PM
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Originally Posted by WhiteKnight '01
A stock G8 GT with 361HP only puts down 294RWHP? That's about the same as a stock LS1.

This is good news for my race against one of my friends who owns a G8 Gt!
Mine was an 09.5 - extra pup cats so factory SAE was 355 not 361.

The 6L80E eats up ~60 hp. My dyno numbers were in line with that.
Old 08-07-2011, 04:42 PM
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with my mods i averaged 28 at 72mph. at 45 i averaged 41mpgs
Old 08-07-2011, 05:37 PM
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Originally Posted by Thebeast916
with my mods i averaged 28 at 72mph. at 45 i averaged 41mpgs
41 MPG in a 6.0 liter 4,100 lb car? Is that what the computer is telling you? Or did you do the math yourself...miles driven divided by gallons it takes to fill up?
Old 08-08-2011, 12:11 PM
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thats what the computer said. remember with the dod on. it runs on 4 cylinders. just under like 10% throttle
Old 08-08-2011, 03:44 PM
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Yeah... I don't believe that. The computer tends to not be good at calculating MPG over short terms. The accuracy is debatable even over the long term.
Old 08-08-2011, 07:29 PM
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The DIC has always been in lock step with my hand calcs. Always. I check it at every fill-up. Hasn't deviated in over two years of ownership. You can play tricks with it in the first 10 miles or so after fill-up but it always settles down to reality after that. I'd never show a DIC reading that went through less than an eighth of a tank. That's just funnin'.

People always say they got "the freak" (never mind that our engines are SAE certified but let's not ruin people's fish stories). I guess I got "the freak" when it comes to DIC accuracy on gas mileage
Old 08-09-2011, 12:44 AM
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in stock trim it was nothing for me to get 29-33mg over 400 mile trip to texas or back since the tune its went down to 23-25 i'm gonna check a few things when i get home cause what i'm getting now is not good
Old 08-09-2011, 09:33 AM
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Even when I was extremely light footed and stock 23-24 is the best reliable number I ever saw. Driving from west to east on a down sloping part of the country I got in the high 20's one time. The GXP gears probably don't help.
Old 08-10-2011, 05:51 AM
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After a 360 mile trip mine got 24mpg. This is an actual calculated mpg, not using what the dash showed me. I am happy.
Old 08-12-2011, 08:35 AM
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Here is mine. It's a 100% stock G8 GT

http://www.mpgtune.com/fillupHistory.php?carId=4837



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