what type GAS?
 

I have been using regular unleaded and so far no problems, but should I be using super instead? don't want to do harm to the engine..
TxDixie- 2005 Jaguar XJ8-Vander Plas

your owners manual will state minimum 91 octane to avoid rdisk of engine knock or loss of performance or fuel mileage.

MaNYN"Se you without issue so it's up to you.