Fuel economy and additives

I think the guys above are giving you very good advice. At $2.25 a gallon your doing much better than the rest of us on the West coast. The only thing I can add is if the engine is pinging, then an octane booster will help. A pinging cylinder does not put out the same power as one that doesn't. Lighten your weight as much as possible; don't carry full water. Use paper plates instead of ceramic. Put two bottles of Chevron Techron concentrate in a full tank of gas will clean the injectors. Replace your air cleaner if it hasn't been done and slow down a bit more. There's only so much you can do with these beasts.