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So here come the numbers [Note, I'm adjusting the kWH number for a gallon of gas to 34 make the math easier]

My Wife's Mazda is <very> roughly comparable to my Volt in size/shape/comfort... et-al.

The overall average for her car (city/hwy combined) is right around 27mpg

Given a 14.5 gallon tank that means her car holds right around 493 kWH of energy in the gas tank to go 390 miles

This gives us a relative efficiency of about 1.2 Miles/kWH.

Since a Volt (and similar EV/PHEV) generally run at an efficency of about 4 Miles/kWH, We don't need to store the energy equal of 14.5 gallons of gasoline, we "only" need to store 97.5 kWH or the equal of 2.8 Gallons of gasoline and if we somehow were able to store a full 493 kWH our range would be something like 1,900 miles (wouldn't that be cool).

Yes I know, "refueling" a 14.5 gallon tank is a much different proposition from charging a theoretical 493kWH battery in a reasonable time.... that is a different discussion.

Anyway, does my math check out?