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To me I wouldn't think a casual warming of the fuel wouldn't help fuel economy, because the engine is already running about 190-200 deg F and when the cold (relative) fuel hits the chamber it "cools" the chamber by "absorbing" the heat then it combusts and heats the chamber up after the expansion phase.
actually thinking about it you would do better to reduce the amount of heat generated in that combustion while still getting the expansion necessary to get you down the road. If you could delay the valves on the compression side, so that you expansion is greater than the combustion that should reduce the amount of fuel converted to heat, while still giving the expansion, therefore saving fuel.
pressure*volume=moles*gas constant*temperature (pv=nrt), I think this explains it better. If at the end of the expansion stroke (max volume) you can not increase the volume so the pressure will increase. pretend the max volume is 1 and the absolute pressure is positive (duh) then 1*(increasing number) will get larger and larger until the combustion is complete. so as the pressure increases then the temperature will increase as well. All the heat generated by the car is typically waste heat and leaves the car through the exhaust, radiator, and not as wastefully to heat the drivers cabin.
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