I just bought a 2005 EX V6 sedan with AT. The manual says to use regular gas 86 I believe, so the service centers around town tell me it’s ok to use 85 (no 86 in Denver, altitude thing). I also heard if you use 91, which could be considered too rich, you can damage your engine, especially your 02 sensors or something? I’m kind of a newbie when it comes to car performance. But will this HP increase work w/ AT sedans or is only for the manual transmission coupes? The way gas prices are, my accord is plenty quick, and don’t think I would justify more gas money for only 10hp increase.

I love my new car