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break in gas

526 3
I would like to know how oily gas will effect performance. The reason I ask is I just got my F7 back with a new top end and I put 15 miles on her then lined up with 2 other F7's and got smoked........whats the deal the one F7 that beat me I raced before I got a new top end and we were side by side all the way now he takes me fom hole shot all the way thru. I was wondering if it had something to do with my premix gas that I have in the tank............any idea's boys??