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Originally Posted by jdenenberg
Using heat does accelerate the cooling of the ICE when you are running on electric. The ICE will turn on more often to keep at temperature and slightly reduce your MPG.
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This effect can be mitigated by installing a radiator block in the air grill . . . in 50F or cooler weather. This not only minimizes radiator heat losses but it also reduces the cold-air drag at high speeds.
Bob Wilson