amcomins

Greetings to all from So. Cal. I just picked up the new car today. A young, seemingly knowledgeable tech at the dealership suggested I strongly consider using 91 octane because the gas in Ca. is of such poor quality. Any thoughts? Also, they tried to sell me the Xzilon car treatment. I begged off until I could do some research. Again, any input would be greatly appreciated. Thanks to any and all. I love this car and plan to do everything to keep in on the road for 200k+ miles!