I ordered 2 tunes so far. My main tune is the 93 performance, but I also ordered an 87 performance. I wanted an 87 performance incase I'm in an area that doesn't offer 93 octane gas, or if gas becames really really expensive. My daily tune is the 93 performance though. I will probably order an 87 tow tune in the future, but I am not towing much or that often.
Not sure on the E85.
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