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Originally Posted by Hans
Not taken as argumentative....it is a personal decision. However, given the total miles I'm getting with my cars, it can't be that critical.
That is a substantial increase in mileage you got by switching, but it goes against my experiance and every (independant) study I've read....but I can't argue with your own experiance. If I got anywheres near that increase, any increase, I would most definitly be using synthetics also.
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Prius owners report slight MPG increase w/Synthetic:
http://john1701a.com/prius/prius-advice02.htm
And about studies - that's a stumper for sure. The problem is, no one will sponsor a study which will prove that Synthetics are better because a) who's going to do that besides an oil company, and thus you lose the independent part, and b) the government does not want to make any of the large oil companies mad by proving it either way. If they say Synthetic is better, then it will force a big change in the whole oil/auto industry, maybe putting pressure on the car companies to use Synthetic in all new cars, which would cost them lost profits. So it's a lose/lose scenario to have Synthetic oil be shown superior.
But MPG is only PART of the benefits of synthetic oil. It also protects better at high temps and high rpms, and coats better thus protects better at startup.
Anyway, I think my points have been made. Use Synthetic oil for many reasons besides a potential MPG gain.....
