I like the idea of using the drain and fill plugs as connections!
Maybe less exciting of an idea, but what about an unpumped loop between the transmission and a coil of tubing in the engine oil pan? It would allow some exchange of heat as the transmission fluid sloshes around during driving, but not rob a lot while the engine is still warming up. And would be really simple.
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Best tank (so far): 32 MPG
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