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Not sure about M3 vs M5, but I've seen back to back testing with M1 vs M5 on FI turbo car and with no adjustments the M5 fuel shows 4-5% increase over M1.
Not sure about M3 vs M5, but I've seen back to back testing with M1 vs M5 on FI turbo car and with no adjustments the M5 fuel shows 4-5% increase over M1.