I recently bought a Cortex 1950 model for my 2007 4.2L F150 because I lifted it and put bigger tires on it and wanted more power and better mpg. I have a couple of questions. I am currently running the 87 octane performance tune, with the the speedometer and rpms raised and the shift points and pressures at superchips level, and my truck does seem to run and shift harder. But, I wanted to know what would be the best tune to run on my truck and if 87 octane tune was the only one available for my truck?
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