The fuel pump in the V6 will handle the E85 with the larger injectors.
You will need a tune for optimum performance, and the engine is 210 HP,
expect 223-225HP with E85 tuned right, with an intake, and the larger
injectors.
E85 will end up costing you more, because it has less energy output (BTU)
per gallon than gasoline does. In the end, you will use more E85 than fuel, so
you may end up paying the same, because you will be at the pumps more
often than with regular gas.
I run 25% E85 with 87 RUG. I fill up, run to 3/4 tank, then top off with
E85. So far, so good... Car is actually liking it...
E85 is rated at 100-105 octane, runs cooler than traditional gasoline thus allows the
car’s timing to be increased, making more power overall. However, these 4.0s
are not VVT engines, so they will NOT benefit like the 3.7 V6 would with VVT. All
the 4.0 gets is spark timing advances, no cam timing advances. The only way
to get results with E85 on the 4.0, is boosting the motor.
AS mentioned, but lets go further; E85 has about 33% less BTUs than traditional gasoline.
As a result, this decreases fuel economy. While the price per gallon may be cheaper than 93
octane gasoline, you will be buying more of it at the pump. It’s best to see how often you
drive, how far, etc. to determine if it is worth the potential additional fuel cost. If you
like what you feel, and race around a lot, you will lose money on E85. You will be as low
as 12MPG with E85 with the 4.0 V6.
Once you tune it to E85, you can't run regular fuel, when you change out the
injectors for larger ones. In reality, all you need is the injectors and tune. Like,
the GT only needs 47lb injectors and a tune to run E85.
The corrosive thing is not true, that's METHANOL, not Ethanol. The problem with
Ethanol, is it absorbs water from any moisture sources. If the car sits for 30
days, you can probably count on that Ethanol you put in, now being water...
It is, however, a dryer fuel, and can ruin gaskets and seals faster.
Also, yes, E85 is cheaper because it's not taxed yet.
Also, on my '08 Mustang Gas Cap:
Tells me all I need to know about what fuel NOT to use...