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Those 175/70 tires have a 8.5 mm higher sidewall than the 175/65s.
So they were about 3% bigger than the 65s.
If you did not compensate for their size in the odometer readings, and you seemed to use 2% more fuel on them, in reality they were saving you 1%...
If 175/70 R14s were OK, then get the 165/75 R14; those are just a few mm taller.
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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.
Last edited by RedDevil; 03-20-2015 at 10:14 AM..
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