Today my sister took delivery of a brand new 04 TSX. This replaced a 99 Grand Cherokee that was starting to show it's age, but anyway it's nice to have a couple of Honda vehicles in the driveway again. I don't know much about it yet, but I was wondering what octane rating should be used? The Manual says 91, but goes on to say that a lower grade can be used with reduced performance. The gas stations around here have 87-89 and 93, so 89 isn't too far off, but we don't want the car to run terrible, so any suggestions would be great. Heres a few pics of the trio.