[Calvin36]

I don't have any evidence on paper or anything but I do notice that when running ARCO gas I don't get as much MPGs per tank vs Chevron. My fiancé used to run whatever gas and it was apparent that Chevron does run longer.

But to be completely honest, we're all driving $40k+ cars.. are we really going to nickel and dime on gas? There is research out there that shows bad gas can lead to earlier knocking and other issues. I'd pay the extra X cents per gallon for that piece of mind. Our cars aren't necessarily cheap to fix!