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Maybe this is a horrid idea, but how about reducing the heat capacity of the cooling system? Higher glycol concentrations bring down the heat capacity pretty fast.
Also, I suspect that engine oil has a lot to do with short trip economy, I'm going to try to put 5W-20 in next time instead of the 10W-30 that I got from a oil change place. Supposedly not all 5W or 0W are equal, a 5W-20 is quite a bit thinner than a 5W-30 when cold. 0W would be better but I have an oil burning early 1ZZ so I'd rather not use an expensive oil.
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