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Moderator, Retired
Originally Posted by
LDM
I got 24.4 MPG on the trip to and from the dyno in CT. That included the dyno pull.
I was getting 29 and once got 30 mpg when I had AFM.
Rest in Peace Charlie!
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Just a GT
Originally Posted by
RichsGreyGT
this site is hardcore modding central.
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Senior Member
Ill be leaving around 1 eastern time, ill post my mpg for the first leg and let you guys know. Ive been running premium fuel, you think I should run 85 or 87 instead?
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If it's not tuned for premium, run mid grade. 89 I believe is what it calls for.
2009.5 MSM GXP 500ish N/A RWHP. Mods include but aren't limited to: Texas Speed 418 (6.8L) fully forged held together with ARP from top to bottom, PRC 255cc heads, Rick Crawford intake plenum, TB port, polish and tune, Roto-Fab 102mm CAI w/LS7 MAF, Kooks 1-7/8" headers wrapped with DEI, Corsa catless system, Circle D 3200 Stall, 3.45 final drive, BMR's complete street bushing kit and sway bars, Eibach Pro Kit, G-Force Axles, running on staggered VMR 710's with Bridgestone RE11 rubber. HSV triple gauge pack with Calais smokers kit mod, V6 tails, debadge/rebadge, V6 door handles, AU black door trim, Maverick Man under hood strut covers, & washer and bolt kit, fully corrected paint thanks to Adams Polishes and my hard work. Built with reliability in mind with some power for those times when you need to pass or go over a big hill. Just a poser, not a racer!
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Senior Member
All the owners manual says is at least 87, but the midgrade will save me 10 to 20 cents a gallon. Thanks!
Last edited by EngineDweller; 04-09-2014 at 08:51 PM.
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Moderator, Retired
Unless you have a custom tune run 87 octane.
Rest in Peace Charlie!
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Just a GT
Originally Posted by
RichsGreyGT
this site is hardcore modding central.
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Originally Posted by
-Ray-
Don't ask cammed and supercharged guys questions about fuel economy. They have no clue. LOL
What's next Ray, a jab at V6 owners? 
On a trip from Michigan to Maine I got around 25-26mpg... There's some very low frequency drone with my exhaust so it was easy to know when AFM was on which worked in my favor.
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Originally Posted by
EngineDweller
Quick question...gotta drive the G8 to Michigan this week, any tips on fuel economy?
Where abouts in Michigan you going? I'm sure some of us could advise good spots to eat or things to see if you have time. Also, check out gasbuddy's app if you have a smartphone. Gas can vary by 10-15cents a gallon, sometimes more, within a few miles.
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Beyond Help
Originally Posted by
Frostopsy
My H/C/I LS3 can get between 25-30 highway. The secret is to find the car's power band and put it in cruise control. Usually it's around 70 mph. Cruise control is the key though. Our only problem is the small gas tank.
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I wouldn't necessarily call 19gal small...
2015 White Hot Chevy SS - Sunroof/Spare/Stick - BTR Stage 3 cam, headers, intake *Traded 11/11/2023*
2018 GMC Sierra Denali 1500 - 6.2L, Ultimate Pack *Turned in 4/13/2021*
2016 Jungle Green Metallic Chevy SS - Sunroof/Spare/Stick *Traded 2/1/18*
2011 Radiant Silver Metallic CTS-V Wagon - Corsa Axleback, AirAid Intake *Traded 7/7/16*
2008 Panther Black Metallic G8 GT * Sold 6/10/14*
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Senior Member
Originally Posted by
Slizzo
I wouldn't necessarily call 19gal small...
For a 4000lb car with a 6.0L V8? Yah, pretty small. You only have 16 gallons before the gas light comes on. The TBSS has a 22 gal tank.
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(shrug) our 'Burb has a 30something gallon... it's all in how you drive it.
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