I recently bought a used 2008 Acura TL. It calls for premium gas only,they only used reg. Would it hurt to go back to premium?
Is the premium necessary?
If the owner's manual calls for premium, my advice is to use premium and it says regular, use regular. Use premium because prolonged use of regular might cause the car engine to knock. Check out www.straightdope.com/columns/read/2565/whats-the-difference-between-premium-and-regular-gas for more details.