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My apologies, I didn't see the DIY Ethanol Sensor listed in mycbtech's mods. If your concerns are a reduction in overall octane, then please see below: Check out the attached file to see calculated octane values for Ethanol blends with premium. The chart shows a true 50% E mixture with 91...

It is possible to get to 50% Ethanol while blending "E85" and 87 octane fuel. Your question leads me to believe that you aren't actually measuring the "E85" coming out of the pump...If you aren't you should be. I've seen Ethanol content for "E85" anywhere between 52-89% depending on season and...

Read the ECU before and after the dealership flashes the ecu. Load them both into the VCM Editor software and use the "View Comparison Log" option and you can see everything they made changes to. If you are worried that Ford might actually be making updates that you want to incorporate into...

Using a (free) program like WinISD why don't you try seeing the impact of changing the tuned port frequency between 36 and 40hz. I'm guessing it isn't that much of a change in the roll-off.

That has not been my experience so far. Actually, I received my order late afternoon the Saturday before Easter. It's taken at longest, 3 days to get a response and revision to an update request as of this last weekend.