Quote:
Originally Posted by djeepin
Winter gasoline lacking some special additive, that slow down evaporationg of gasoline in hot summer weather. And its not an ethanol, and not anti-detonation addtive. Dragging brakes, dirty air filter, thick oil - among other things contributing to fuel consumption.
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I can testify that thicker oil receded your mpg dramatically. When I first got my 4Runner I wasn’t used to the little ticking noise the engine makes. So I used thicker oil to make it quieter. It worked! My engine was much quieter but my gas mileage dropped 2 mpg.
