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I get that, but it takes much more energy to heat up all of the oil (and engine parts) than just the intake air if raising the pre-combustion temperature is the goal you're after. Which I am.
I see the benefit of heating oil. Let nothing distract from that.
Even so, there is a time and place for other systems like heating the intake air. I see my car heat up pretty quickly, but in those few miles it just wastes a lot; those few miles are my target.
The air that gets out passes the catalytic converter first, which only works well when hot enough. Badly burnt cold exhaust gas is a double reason for preheating the intake air.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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