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Originally Posted by lars-ss
On Synthetic oil, well, there is really no solid, undeniable, scientific evidence that it helps your MPG. What it DOES DO, without a scientific doubt, is protect your engine better than Dino oil. So if you want to protect your engine in the best (not cheapest) way, synthetic oil is better. Not necessarily for increased MPG, though. Synthetic oil in my 2004 HCH made ZERO difference at all in MPG, and I checked it carefully.
To each their own, and Your Mileage May Vary (but at least you can hope it varies UPWARD !!!) 
Lars |
Well I don;t know of any scientific report, but I know that I had 1730 miles at my foirst oil change, my tank average was climbing slowly and was at 36MPG when I did first oil change and put in 0W20 Synthetic. I then went and filled the tank. I have 70 miles on this tank right now and the tank average is about 40MPG. I attribute some of this to 0W20 Synthetic and some to more engine break in and me learning to drive the car better, but a 3-4 MPG boost over night, some has to go to the oil. I can feel the car running smoother on cold startups. I was sold back in 91 when I tried it on my wife's Celica an noticed the same thing. At that time I went from 10W30 to Synthetic 10W30 so no weight change, but noticed the smoother running engine immediately. It was most evident on the initial cold start as the engine just purred right away instead of that normal minor struggle when first spinning up. When I moved to V6s I still used Synthetic, but the fact that V6s run smoother and had more power anyway I was never able to really feel the difference in them, but assume I gained a minor improvement in MPG anyway.