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Yes, you cannot compare MPG per distance (miles), just per gallon. That's where the PG stands for.
You cannot add up by trip MPG. You can add up per tank MPG, if you keep filling more or less the same amount.
Likewise, if you try to add up the l/100 km readings, you cannot work by the tank fills; then you need constant distance.
Both notations have a dividing part. It comes down to this:
You can only ignore the dividing part if that part is the same for all readings.
What works every time is total all the miles and divide by the total of all gallons, etc.
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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; 05-26-2014 at 04:59 PM..
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