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That's why I post this thread again. I did a lot of reading in several forums. People say synthetic oil should save some gas because it lubricates better. However, nobody says he got FE increase like 1 mpg or 2 mpg. If the claim for 2% is correct, cars get 40+mpg must see the increase in FE (0.8mpg) Even it is not exact 2% increase, maybe we can find 0.5mpg increase consistently. Anyone can see the different after using synthetic oil?
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