Great site with lots of good info. Just got my 1865 tuner for my 1999 F150 4x4 with 5.4L, and like what it does to my truck. I was able to adjust for larger tires and correct my speedo, which was a nice add on. I have been running the Performance option, and have a few questions. When I install the Perf tune, does it automatically make adjustments to optimize my transmission? Are there any tranny related adjustments that I can make with either the perf tune or the 87 tune that will enhance transmission performance, or are the SC tunes the optimal ones to use? If yes, can you specify? Lastly, can I switch over to the 87 tune with a tank full of 92 octane gas for MPG comparisons, or will the higher octane gas skew the results?
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