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If it is not intended for E85 the I would not.
It will run lean and cause a code and may be poor in running.
The bad fuel mileage won't save any money.
Only new model F150s(I believe 06+) can, b/c they have a FFS(or something like that)which means Flex Fuel System(I think it's system, but I know it's flex fuel).
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
