[70Sixter]

I've never put in anything but 93, but as others said some 91 won't hurt - especially in highway cruise mode. With knock sensors there is little chance of ping or pre-detonation anyway.

I've also come to fear that with high gas prices some cheaper gasoline companies are cutting additives to offer lower prices. Check out this website for Top Tier brands.

http://www.toptiergas.com/retailers.html