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Re: 02 impala gas mileage
It's about time to change the plugs. Generally at that mileage, the plug tips will be worn and the gap will also be larger than it should. Changing them should give you increased power and better gas mileage.
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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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