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Not to confuse you more but a lot of people measure their watt hours per mile at the outlet, just like you figure out your gas mileage at the pump, they put a watt hour meter on the outlet they are charging from and see how much it takes to fill their batteries then they look at how many miles they covered.
There is also a brand of meter called the E-meter that some people use because it can log how many amp hours you have used out of your battery pack and tell you how full it is, but I think that meter also converts it's readings in to watt hours as well, so you can figure out your watt hours per mile at the end of a trip even before charging, I like to factor in the energy that is wasted in the battery charger too so my watt hours per mile (about 300 WH per mile) is higher then if I were to log the energy that I was pulling out of the battery pack, I do it that way because I have a meter that gives me a state of charge in percentage, so I just do my best to make sure to recharge before I get to 50% full.
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