[KevinH1990]

I've seen some evidence that it will run well on regular, but I am cautious about switching.

A fellow I worked with until a couple of weeks ago uses regular in his 04 non-S. He e-mailed me the other day and said he was getting 31 mpg with no noticeable decline in performance. He did tell me he was trying to coast up to traffic signals and not drive as fast as he would like.

I'm cautious because I don't know anyone who has used regular for a long period of time. I just completed the process of sorting out some problems with my fuel system. My car is running fine now, so I'm staying with 93 octane fuel. I don't want to disturb my cars equilibrium, and I won't switch until I see some really hard data and not just anecdotal evidence. The savings is about 20 cents a gallon in my area, so that is less than a penny a mile when driving on the highway.