My F150 is a flex fuel vehicle, rated for E85. It's hard to find in FL, but we have it on base. It's MORE expensive than E10 fuel here.
I decided to try it. Ford claims a loss of 4 MPG, on hwy, or in town. That's directly from their literature (2010 F150 brochure). My truck has a 5.4L 3V V8, which develops 310 hp and 365 lb.-ft. of torque (Regular gas) ... or 320 hp and 390 lb.-ft. of torque (E85 fuel). A gain of 5 HP, and 25 lbs. -ft of torque, but a significant loss in economy.
I can detect a little more get up and go on the E85. Normally, the engine has a slight hesitation (common). Not so on the E85.
The van at work runs exclusively on E85. Little harder to start in colder weather (in the 30s), but runs fine. The exhaust definitely has an alcohol smell.
According to this website (EPA fuel #s), the F150 does lose 4 MPG in town (10 vs. 14), and up to 6 MPG on the HWY (14 vs. 20):
http://www.fueleconomy.gov/feg/bymodel/2010_Ford_F150_Pickup.shtmlA 29% loss of economy in town on E85. A 30% loss on the hwy.
In my real world testing, I noticed my fuel economy had dropped from the normal 17 MPG, down to just over 12.
I've not towed with E85. Not readily available here, costs too much initially, and the poor fuel economy makes it a poor choice.
And as far as blending the fuel, this is what Ford has to say: "The 5.4L is also Flex Fuel (FFV) capable, so you can run it on E85 (85% ethanol/15% gasoline), straight gas or any blend of the two." This information also from the 2010 F150 brochure:
http://www.ford.com/services/assets/Brochure?make=Ford&model=F-150&year=2010&postalCode=
Robert
Merritt Island, FL
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