With my 15" wheels, I actually saw 25 mpg at 85 mph in the heat of the summer (90+). Of course, if you read my previous post, that is with bad O2 heater wires. With my 17" wheels, I have seen as good as about 22-23, though it has been a lot less lately. Once my problem is fixed, I should be up to that again, at least. Joel '90 V8q '86 5kcstq