I Beat Tetris
Dunno what stations you've got around where your at, but my truck hates Sunoco gas. Doesn't matter what grade, it hates it, runs terrible. Shell always gives me crappy mileage, Hess and Racetrac always run best for me, and also are usually the cheapest around Orlando. 89 or 93 depending on what tune I'm running.
Record Breaker
Manual will tell you what you should run as far as octane. I use what ever I am close to, usually the gas stations on base. If I am on a road trip its either shell or texaco.
Professional
89 octane or mid grade. When i bought my truck new, it came with a tag that mentioned something like "87 is required, but 89 is recomended for performance. I've used 89 for the past couple of years, and i can tell a difference compared to 87 octane.

