I avg 22mpg with mixed city/higway driving and I drive pretty fast. I run 46 PSI in my tires and a K&N Airfilter. I'd stay away from Synth Oil unless you wanna just waste money. It won't noticeably increase mileage or power.
QUOTE(Trout Man @ Jan 10 2008, 12:13 PM) [snapback]10256[/snapback]
I have an 07 Rav4 4cyl 2WD with 20k miles on it that is all over the place on the mileage I get. On a recent trip, I got 23.5 mpg on the way there and 30 on the way back - mostly all hwy miles. Huh?! Itraveled the same route, at the same speed, and although wind and temperature conditions were somewhat different, surely that wouldn't make that much of a difference...
I never know what to expect from gas fill to gas fill and am alternatively hacked off and pleased with the results. Anyone have any clues as to why there is such variation in my MPG?
A head wind will kill your mileage as the engine is working that much harder to maintain speed. Temperature will do the same as heat robs your engine of power and has to turn slightly faster to maintain your desired speed.