I'm trying to explain to myself why my vehicle ('98 'Burb) has never gotten over
15 mpg while others report up to 20 mph. In my experience, the roof racks I have on it are good for maybe 1 mpg - which leaves the rest in question.Does anybody notice different MPG figures for the same temperature ranges in different states?
Somewhere I heard that different states mandate different percentages of ethanol in gas that's sold there.
I'm pretty sure that adding ethanol reduces MPG....but don't have any idea whether it's by a significant amount.