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If minimizing engine heat losses outside of coolant flow is the goal, then the best way to do that would be insulation or a low emissivity coating (example, polished or chrome plated engine).
I'll do a test of MPG for the first 2 miles after a cold start and then repeat for a warm start. If it is a significant difference, then an electric engine heater might be worth it, even in summer.
Last edited by jonr; 07-10-2008 at 12:17 PM..
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