Great detective work on exposing KPIP!

Any Ford dealership parts guys out there? I wonder what differences there are between the gasoline only trucks and FFVs in the parts book? As far as I know, the tanks and fuel lines are the same.

Ethanol is 200 proof booze, hooch, moonshine, so the horrible "corrosive" effects you hear about are familiar to most of us. Not a big deal. Have not seen a beer can or plastic vodka bottle disintegrate yet.

The two biggest problems with flex fuel are:
1] E85 is high octane ethyl alcohol mixed with cheaper gas than you can buy at the pump, so the octane is lowered.
2] Flex fuel cars are all made to run on gasoline, with ethanol only an option. There were cars that kicked up supercharger boost on E85 [1996 Mustang Super Stallion]. There are projects that use ethanol better [ford Bobcat project]. Nothing you can buy here and now.

I want to know if I can run ethanol mixed with 87-octane gas in my '03 5.4 l. To know that, I need parts info, info from stuporchips hifortech or doblow tuner makers. Ideas, anybody?

 

What you need to know is the flex fuel engines use a sensor in the fuel system to detect changes in specfic gravity of the fuel flow as a way to determine the fuel is anything other than straight gasoline.
This detection makes changes in the PCM operating program for timing, fuel injection and conversion readings from the OX sensors.
.
Remember the OX sensors are calibrated for gasoline and will see the extra oxygen from the alky and could set a lean code as a result.
The new engines have a bit more compression and take advantage of the Eth octane increase for more power and mileage as well as the automatic program changes.
If you still think you can get the same worthwhile results on a stock engine, good luck.