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For the guys with the diesel engines, one could insulate the fuel tank, use a heat pipe setup to add heat to the fuel tank from the coolant system and store the heat there. A heat pipe setup with a clever working fluid displacer could be used to essentially turn off the export of thermal energy from the tank when the engine is turned off. Gasoline wouldn't work since it would vaporize much more than diesel, so this would naturally be a big issue.
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 2002 VW Jetta TDI 5-speed(completed 01M-5-speed swap at 155K miles) 45 MPG City with the 01M, 5-speed 60+ MPG City. Nokian Entyre Low RR Tires. Experimenting with the "Hybrid" 205 Deg F T-stat:
http://forums.tdiclub.com/showthread...=306799&page=4
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