Quote:
Originally Posted by redpoint5
The only place for fuel savings to come from would be from advanced ignition timing. Unless the car is made to run on higher octane, it won't advance the ignition just because a higher octane is used.
My TSX might advance the ignition another 5 degrees running on 91 octane compared to 87. I tracked fuel economy for several months and didn't significant differences in fuel economy and decided to run regular.
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The F150 is rated to run E85, so I thought that it might have the ability to advance or retard timing in response to a change in fuel. I hope so. We'll see
As for the Hyundai, it was NOT rated for E85. I had been trying to eek out better fuel economy for years, and saw about 1 liter/100 km reduction on the 3rd tank. I have no idea where the difference came from. All I changed was the fuel. Same synthetic motor oil, same road on the way to and from work, to and from the lake, same slightly over-pressured and kinda worn out tires, same nut behind the wheel. Of course the weather was different, but it was not a step change. 6 tanks was just under a month for me
Of course, it could be obvious and I just wasn't looking for it. Which is why the A-B-A testing disproves *SO* many theories.