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Sedans Pontiac G8 2008 Pontiac G8
1265 messages, Last post on Jul 21, 2009 at 10:14 AM
You are in the Pontiac G8 Forum. Your Hosts are pat & karens
4) 300 mile trips maximum MPG is 25.5  ~ 65MPH - 68MPH highway. The MPG does drop quite a bit in city driving but strictly highway is excellent.
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Replying to: elias (Nov 26, 2008 4:45 am) Thanks fo the info.
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** SPECULATION MODE ON ** We know that my Corvette was rated at 15 \ 25. [ Under the current rating scheme – not the one, in effect in 2007 ] And the G8 GT is rated [ under the same scheme ] as 15 \ 24. ** BUT ** that G8 GT highway rating is achieved with use of AFM. [ a.k.a. DoD ] The Corvette’s LS2 does not have AFM. [ Edit: My understanding is that AFM will not engage when in Sport \ Manual mode - ever. ] What I expect is that instead of achieving only 1 less MPG in ** MY ** typical ex-urban highway cruising, I will see a drop of 2 or 3 or 4 MPG. When (semi-)legal I typically cruise at 70 to 75 \ 78. What I have read leads me to believe that at those speeds, AFM will rarely, if ever, activate. Though at 60 or 65 it will, assuming no headwind or upslope. My Corvette would return 27 or 28 or even a bit more, on long highway runs at those speeds, as a point of reference. I am driving this weekend to visit friends who live on the Florida Panhandle – and there are stretches of dead level ( just above sea level ) roads, straight for miles, with little traffic ( typically ) where I hope to experiment under near ideal & controlled conditions. Again – I will report the results when I return – next Tuesday or Wednesday, if all goes according to plan. Clearly, the G8 is much heavier than my ‘Vette. At highway speeds, it has a much larger frontal area & is less aerodynamic. That, plus higher RPM lead me to the speculation \ guesses above. - Ray Cautiously optimistic. |
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Replying to: murphy4 (Nov 26, 2008 7:14 am) |
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Replying to: pao (Nov 26, 2008 11:41 am)
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Replying to: murphy4 (Nov 26, 2008 11:52 am) "poor mileage" ????
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Replying to: rayainsw (Nov 26, 2008 9:57 am) Regards, OW |
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Replying to: rayainsw (Nov 26, 2008 12:22 pm) |
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Replying to: murphy4 (Nov 26, 2008 11:52 am) Not trying to be mean, but trying to be realistic. -mike Subaru Guru and Track Instructor |
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Replying to: rayainsw (Nov 26, 2008 9:57 am) -mike Subaru Guru and Track Instructor |
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