I have my own ideas about motor oil and MPG which are based on time-honored math calculations and backed-up with an aftermarket digital monitor (to check the math). But I wanted to hear what others have found to be true in real-world testing. I am asking what Oil gives you the best gas mileage and how you know this to be true.
I am assuming that a Synthetic Oil offers less resistance, but I could be wrong. I used to use Exxon Superflo back in the 90's (that's 1990s for you comics). Because after exhaustive testing between Castrol, Pennzoil, then Superflo, I learned which offered less engine resistance thus the best gas mileage. I used a sales route that I ran every week and ran a few tanks through each oil change. The route never changed and since it was rural I used cruise control. Not terribly scientific, but close enough to develop a discernable pattern. The Superflo won handily.
As they say, your mileage may vary, but what is your experience?
I am assuming that a Synthetic Oil offers less resistance, but I could be wrong. I used to use Exxon Superflo back in the 90's (that's 1990s for you comics). Because after exhaustive testing between Castrol, Pennzoil, then Superflo, I learned which offered less engine resistance thus the best gas mileage. I used a sales route that I ran every week and ran a few tanks through each oil change. The route never changed and since it was rural I used cruise control. Not terribly scientific, but close enough to develop a discernable pattern. The Superflo won handily.
As they say, your mileage may vary, but what is your experience?