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      05-07-2019, 10:26 AM   #206
ecitizen
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Drives: 2013 328i
Join Date: Feb 2015
Location: Arizona

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I'm in AZ with FBO running stage 2, 91 octane 5.7 and it has been great as far as driving. Any reason I should change to ACN and will it have less power or just not as harsh on the car? I use shell 91 octane.
Have you data logged your car?
No I haven't.
Highly recommend that you do on your current OTS map to see if your car is actually ok. These 3 states and more on the west coast are well known to have truly bad gas. Best to be sure for your case
Thanks. What might the gas cause if the car feels like it runs fine and what's the difference with the ACN tune?