Dr. Bob,
Your 17-18 mpg is good for the mods. My trouble, maybe yours, is heavy right foot equals not the best mpg. Remember, the fuel is going in at a larger rate now. Also, you can't get that feeling from your wife's minivan.
I live near enough to Ind. to buy cheaper fuel there every two weeks. The choice is yours where you buy. Can you imagine paying for an 18 wheeler fill up?
WAYNES WORLD