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Originally Posted by bikepilot
One area where the heater will improve mpg is if you are in the city and the motor is hot enough that the cooling fan or fan-clutch is doing its thing  |
I've done that, when it's 100+ degrees out.
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Very true on the second point, on the first I'm not sure - the t-stat stays closed till its warmed up regardless of whether you have the heater on. Only diff is flow though the heater core vs/rad. Having the heater on shouldn't alter warm up time much if any.
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Sliding the temperature selector to Hot, even with the fan off, extends my already long warmup by miles. Maybe not all cars are like that, but mine is. I guess my heater core is a direct line that bypasses the thermostat.