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Have a 2017 440i Xdrive convertible with a JB4 and an MHD backend flash. The only bolt on attachment is a BMS intake. Working with Burger Motor Sports (BMS) remotely on the turning (sending them logs for analysis) and I was informed that my 93 octane pump fuel with Lucas Octane Booster was not getting me to the E40 (97 octane) level I was seeking. Do any of you have experience mixing fuel for performance street tunes? If so, do you use any octane boosters or E85 mix? Unfortunately my closest access to E85 is 70 miles way so I would prefer an octane boost product if any of them work. Any constructive input would be appreciated.
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