Posted 3/20/2008 06:40 (#337693 - in reply to #337506) Subject: RE: Speedometer/odometer calibration vs actual miles travelled/road speed?
Chebanse, IL.....
Couldn't some of the difference be "rolling resistance" of the bigger tires? Whether they're wider or higher, if they have more footprint on the surface, they have more rolling resistance unless someone puts 200# of air in them (CAUTION!! DO NOT DO THAT!!!!).
I wouldn't have thought 4.0 (four point zero) mpg increase would've been possible....but who knows?
Gas pickups and performance chips
