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Re: 2004 GTP Bad Gas Mileage
Hmmm. I think it may help mileage if it is driven so that during acceleration, some boost is used. When cruising, keep the foot as far off the accelerator as possible or use cruise control. So, give it more gas to get up to speed quicker and then stay the hell off the gas pedal. Seems to work for me. On 100 mile trip in my 07 GT I averaged 28mpg, about 60% highway. On everyday use, the car gets about 22mpg, which includes a lot of rush hour driving.
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Current Cars:
2001 Oldsmobile Intrigue GLS 154k miles
2005 Chevy Trailblazer EXT LT V8 145k miles
2005 GMC Yukon XL SLT w/Autoride 86k miles
2007 Pontiac Grand Prix GT 77k miles
2007 Cadillac DTS Lux II 47k miles
In Limbo:
2003 Oldsmobile Aurora 4.0 - got side swiped while parked, waiting on insurance decision 
Recent Past:
2007 Hummer H3 5-speed Lease was over 7/17/10
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