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I noticed that too. The engine has less friction when still cold, so it can maintain stationary revs more easy, so it uses less fuel, so it heats up more slowly.
Last oil change they did not use Green Oil anymore and the reverse happened.
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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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