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As we've discussed at length in other threads, I strongly disapprove of this energy-equivalence method of MPGe. It doesn't take into account CO2, and it ignores the energy lost when converting fossil fuels to electricity at a power plant and transmitting them to the charging station.
PAX is correct to adopt a single conversion factor for each fuel type, but they should use a weighted average of well-to-wall energy-equivalent MPG and CO2 equivalent MPG.
Their MPGe method has basically handed the prize to battery-electric cars.
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