Proper MPG?

[meerzee]

I am curious as to why I am always getting ~15MPG no matter what. It seems that my 93 octane just floats out of the car. When I observe the OBC and I simply coast slowly around the block, it is registering in the 12-14MPG range. I thought I would be getting better gas mileage, but I could be completely wrong here. I drive slightly spirited, but most of the time I drive perfectly "normal" and rather average. I could have sworn the interstate mileage would be better but even then it doesn't seem to go much higher than high teens. Engine is pretty much brand new since being replaced before I bought the 02 S, but I was just checking out what the proper/average MPG expectations should be.

Thanks.