Something to ponder...I've always used a good grade of gas in my x....BP..Texaco..Exxon..most always the gas mileage has been consistent..17C.19H...sucks, but it is what it is...
I'm at Kroger one night...the guy says you can save 10cents gallon because you have spent $100 or some rot...This was a few months back when prices were doing the creep up thing. and everyone was just thinking the prices were bad...anyway..I thought 10cents..what the hell..so Im filled 'er up..it seemed to run ok no more pinging and knocking than normal...so I used it (Kroger gas) again..I happen to check my mileage after this time and it had fallen to 14 mpg..I didn't think about the gas i was using and was preparing to go through the tune-up deal (it only has about 53k miles on it)and went back to the BP gas...immediately the gas mileage went back to 17...Daddy told me along time ago that you get what you pay for...