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Old 10-12-2012, 07:54 PM
GSXRYDER GSXRYDER is offline
Officially Welcomed to the 'Fest
Location: Sylvainia
 
Join Date: Dec 2007
Posts: 2,246
Mein Auto: Z4M Coupe, 540i,Silverado
#1

problem with most cars is Air pressure in your tires, simple and basic. But, I read a survey where 9 out of 10 cars on the road had wrong pressure in the tires. Now it may not seem like much, but it could very easily impact your MPG. Also things like wheel bearings, alignment, extra weight in your trunk or car, engine splash shield removed, Any excessive electrical draw, like amps subs etc...causing your alt to work harder and require more input from the engine, maf recently cleaned?

You've addressed some big stuff...how bout some of the basic stuff. Also check for the brake drag and warped rotors, anything that adds to rolling resistance will add to increase load on the engine.

Also are your tires 'stock' you haven't added width to the tires ...that too will cut into mileage...GL
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