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Old 01-12-2008, 05:39 PM   #5 (permalink)
jazzie604
Turbo gas guzzler
 
Join Date: Dec 2007
Location: Lexington
Posts: 67

grocery getter - '03 Mitsu Evolution
90 day: 17.55 mpg (US)
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I recently read a magazine article where they tested regular oil against synthetic, and they showed rather large improvements. of course they were testing for max horsepower, but with no other changes they basically showed a change in internal engnie resistances, or internal drag. I would think that anything thats reduces system drag should affect performance, at least to some extent.
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