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Larger rims with the same outer diameter means shorter sidewall height.
Which means that when the sidewall flexes on contact with the road, it bends much sharper than a high sidewall would. Hence more friction.
Then, running them at higher than OEM pressure will have much more effect on FE, diminishing the difference with high sidewalled tires.
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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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