Can Regular gas go in a Jaguar XJ8 1998 model?

While a 1998 Jaguar XJ8 is designed to run on premium unleaded gasoline, using regular gas may lead to reduced performance, fuel efficiency, and potential engine knocking. It's recommended to use the manufacturer's specified octane rating, typically 91 or higher, to ensure optimal engine operation. Using regular gas occasionally may not cause immediate harm, but for the best long-term results, sticking to premium is advisable.