I ran a a bottle of chevron techron fuel injector cleaner through my 98 TA (52,000 miles.) You have to let the fuel level get down to around 12 gallons before dumping the stuff in. I actually filled up before it was empty so i dont think I even got the full effects. Previously I would average around 15.5 mpg last fill up I got 17.5! My commute to work is 1.2 miles hence the bad overall gas mileage but, I was pleased with the results. It says two treatments may help even more so I'm going to try one more bottle and let it run all the way to empty this time.

btw i picked it up at wall mart for like $6

 

Chevron w/ Techron is a good fuel. They were one of the first to meet manufacture's more stringent "Top Tier" designation.