I find that my summer tires give worse economy than my winter tires in the same circumstances, which is only logical as they are a lot stiffer, wider and on 16 inch rims.
But they will stay intact when it gets really hot  and then of course the economy is much better.
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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.
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