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We have some strange efficiency related taxing on cars over here. Manufacturers recognize the need to stay within certain tiers to be competitive, so they tweak their cars to just make the threshold.
That usually means raising the OEM tire pressure (Chevy set it to 3.0 Bar for its Dutch Aveos where its 2.2 or 2.4 for the same model elsewhere).
Another trick is narrow tires with high sidewalls (R15 instead of R16 etc).
My 175/65R15 winter tires are more economical than my 185/55R16 summer tires.
It would show in my tank log if it wasn't for warmer conditions in summer...
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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 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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