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The engine warm-up isn't the only issue, though. The temp of the transmission fluid, tires, bearings all affect efficiency, and warm up much slower than the engine coolant.
I've seen this during testing. Repeated runs over the same stretch of road on cruise control, the segment MPG readings continue to climb for a surprising length time after the coolant temp stablizes (indicating the other components are still getting up to temp).
Haven't measured it for my car. I'd be a little surprised if it were as much as 22 mi., but it's certainly well past coolant max temp distances.
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