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graver555 · 04-04-2014, 01:55 PM

I have heard some engines can get better mileage with 91 octane, because the knock sensor will advance (or Mayby it was retard, I'm not sure) the timing. Any truth to this? Would it be worth experimenting with?

04-04-2014, 01:55 PM	#1 (permalink)
graver555 EcoModding Lurker Join Date: Apr 2014 Location: Indiana Posts: 23 Thanks: 5 Thanked 0 Times in 0 Posts	Ford focus 91 octane question I have heard some engines can get better mileage with 91 octane, because the knock sensor will advance (or Mayby it was retard, I'm not sure) the timing. Any truth to this? Would it be worth experimenting with?