Originally posted by crager34
Seem to be getting a little better mileage with the mid grade...I think it's 89 here in Columbus, OH. Better by about 10-20 miles is all.
FWIW, it is usually cheaper to buy 87 and 93 in proportion and let your gas tank mix them up to 89. In fact, that is usually what the gas station does at the pump anyway, they don't have a tank for 89.