Well that answers a question or two I had.So much misinformation here its silly.
Well first and foremost, your bronco has wideband 02 sensors and will account for any blend of ethanol above or below what its been calibrated for which is 14:08 e10 pump gas. The bronco along with most other vehicles that use wideband 02s, have the ability to add or take away fuel based on the ethanol content they are seeing after the exhaust cycle. As the bronco sees more or less ethanol, it can add or subtract out fuel based on your short term fuel trims.
For the cleanest fuel trims, try to use e10 based pump gas. Thats what its calibrated for. If you are one of them "I wont put ethanol based fuels in my car" idiots, then your bronco will always be adding fuel volume via the fuel trims to offset the constant lean condition you are trying to put it in. If you refuse to use e10 gas, you are using more gas than you need because you will always be + whatever percentage fuel trims that you are down when the vehicle is trying to keep stoich (14.08). You'd be far better off running e15 to get the added knock protection the extra ethanol will give, while letting the bronco pull out that extra 5% or so fuel that its seeing after the fact. You will always be at stoich but your trims will be pulling out a small amount of fuel to keep you there. But you get that knock protection.
This is why tuners will ask if you run one of those piggy back tuners that you run e20 or e30 blend. The bronco is more than capable of pulling out the extra fuel via the fuel trims as needed, but you are getting a tremendous amount of knock protection as the bronco adds timing which in turn adds power. The more timing it adds without seeing spark knock, the more power you will make. This is why its always better to run e20 or e30 over say racegas. You get to pay for cheap gas, and you get the knock protection without running any octane booster or $10 a gallon race fuel.
This is super common in the coyote world as well as other platforms that run factory widebands.
Oh and lastly auto fuel systems have been ethanol friendly for 25 years at this point. I think it was 2000 when cars had to be able to run ethanol based fuels and not have parts in the fuel systems that would corrode due to the extra moisture that ethanol can pull in.
Ethanol free gas is really only made for lawn tools or other small engines that might sit for months or years without running. Or older cars.
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