Originally posted by javaContour:
Gasoline is probably the cheapest thing you will every buy for your car.
Assuming 15K miles/year at 25MPG, you will buy 600 gallons of fuel/year. If the cost difference between 87 and 93 is $0.20/gal, then you will "save" only $120 or about $10/month
For those of you who live in an area where the difference is only $0.10/gal, then you will save a whopping $5/month or $60/year.
Most of you don't have the time/resources Big Jim has to work on his car. (Like a Ford shop that he runs, not a knock on Big Jim, just the facts.) So your best bet is to run the fuel that Ford/SVT recommends.
TB
Who knows gasoline is the cheapest fluid to purchase at the Quicky Mart, in any grade 
Your tag line touches on a very important point. The brand of gas may be every bit as critical as the octane rating. I only use name brand gas. Chevron is my usual but Unocal, Mobil, Texaco, and Shell are also used frequently. Non of the cheap stuff from Arco, Thrifty, UltraMar, or the like. It doesn't matter how high the octane is if it is contaminated or poorly blended. It only takes a small quantity of water or trash to do a lot of damage. In my mind a tank of Arco 91 octane is much worse than a tank of Chevron 87 octane.
