Never used enough Chevron to notice any difference. I just use Fuelly and buy the cheapest gas I can find. $1.749 for the last few weeks. I do see fairly large discrepancies when filling at stations other than the local Costco, which has a drainage depression which, when my front wheels are in the depression, I get much more consistent MPGs, tank to tank.

EPA uses Certification Gasoline.which is high octane pure fuel with no ethanol in it. That's what I use. If no Chevron stations in the area where I fill up I then use Shell 91 with no ethanol.
Never have had a fuel related problem with any of my cars. ( as long as filled up with non ethanol)

No such thing as none ethanol gas sold here in California, that is unless you own a diesel.

:)Have a friend near Anaheim who loves the drive north to treat her car with pure gas.

At least California does not sell the fuel they have in Montana :eek: