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An overage on oil should spill out at some point, but won't hurt FE on most engines.
Unless the oil was of a thicker grade than need be.
Low tire pressure does hurt FE! Anything south of 40 PSI hurts, the lower the worse.
And do heat up the planet! Cold makes the air more dense and prolongs the cold start. Really cold starts are dramatically bad.
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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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