My engine has over 165,000 miles, and is about 8 years old. Keep the engine in good running order, and adjust your driving style. I regularly hotlap and autocross too. Worst mileage was 11mpg after a full day of hotlapping Streets of Willow.

And guess what...





...I use ARCO gasoline. No lie! Been using mainly ARCO for the 8 years I've had my car (there's a station down the street from where I live).

So don't believe the hype about ARCO messing up your engine.