- Mar 15, 2006
- Buffalo, NY
I sorry if I'm I did a search, I swear, and found nothing, recent at least. I know it's almost impossible to gauge for the average person, seeing as so many factors come into play regarding avg. gas mileage on any given vehicle. Factors such as ambient temperature, road grades, not filling the tank to the top throwing off calculation, weather conditions, wind, avg. speeds and acceleration styles, etc. But do most here believe that you get perhaps an ever-so-slight boost in fuel economy using synthetic oil of any of the three groupings, especially Groups IV & V? For me, the anecdotal evidence says "yes." My experience is that I've had some minor to some not-so-minor gains in mileage after switching from conventional oils to synthetic while driving long distance. Day-to-day local driving, not so much... But --I know I've read a study done by some university in which they tested the fuel usage by comparing two identical tractor engines; one running Mobil1, the other running Havoline, with both weights at 10W-30. The result was that it was a wash I believe. But then again, I'm not sure this adequately replicated everyday driving...