Jason Fenske (Electrical Engineering channel) had an interesting take on tire and wheel size versus economy:
He focused on the effects on economy at 75 mph from a theoretical point of view, but also using EPA data. And he doesn't waste time; it is 11:47 packed with data and calculation.
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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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