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Before I had my UltraGauge I had a cheap digital in/out thermometer on the dash, with the out temp feeler in the air intake. It even works when the key is off.
I could see it rise when waiting at the lights with the engine off, as the heat of the engine heats up the then stagnant air in the intake.
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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 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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