You can use up to E85 fuel (85% ethanol) but with the loss in fuel mileage compared to regular gasoline, you will either break even or spend more in fuel using it.
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2011 Ranger XLT, 4X4, 4 door Super Cab. 4.0L, 5 Speed M50D-R1HD, 3.73:1, 8.8" open differential, Jason Pace cap
1999 Honda CR-V EX, RT4WD, 2.0L, 5 Speed MT, 4.56:1, open differential