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Forgive me if I'm wrong, but what really matters when adding up the MPG's is the number of gallons you put in.
If you tank the same amount every time, say 10 galllons, then 130 MPG will get you 1300 miles on a 10 gallon tank and 70 MPG will get you 700 miles on 10 gallon.
That is 2000 miles on 20 gallon so 100 mpg average...
It is actually quite easy to keep tank volume constant; if you have a 15 gallon tank, dirve till it is nearly empty then you can add exactly 10 gallon every time (even though it is not really full).
Or you can just fill it up, enter the receipts in your tank log and not worry about these details...
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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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