I also have been using United Boost 98 in my 03 XR6T for a while, and I have found it to be the best fuel for my T. I tried Vortex 95, BP Ultimate and Mobile Synergy, and the United Boost 98 came out on top, its cheap as, the car runs beautifully, gets good economy (I'm happy to get 400kms out of a tank with my driving) and good power. Best part is that it is cheap!