If your going to heat the fuel why use electric? causes more electrical load on your car, use that waste heat the motor makes so well, do a coolant exchanger.. can be as simple as a copper or aluminum pipe with-in a larger rubber heater hose. Thats how us Veggie Oil burners do it usually, or you can by small flat plate heat exchangers to do the same thing.
The ICE wastes so much energy as heat its ridiculous.. use it..
One other i though i has was a peltiere cooler type of device, there make ones that generate power from heat sources too, a big aray could replace your alternator.. no load , and recapturing that waste heat.
__________________
|