Miles-per-Charge is still really a range "kind-of-thing". In the Tesla Roadster there are several modes you can charge and drive with. Quoting 244 MPC is really not a real-world practical equivalent of the ICE's MPG rating. Just like the size of an ICE's gas-tank will vary, so will the "range". Therefore quoting 244 MPC would also necessitate mentioning that that is achievable only (in addition to a lot of other efficient driving stuff) if you charged in Range Mode (on the Roadster). In the ICE world, either the range is so large that you don't care (or so quickly "re-fillable") or the advertised total range on a tank of gas is so less well advertised that most of us can't tell you what it is. In an EV its "range" is a much more critical factor ... but still it would be a disservice to equate it with MPG.
The ICE's MPG really is meant to tell you something about "efficiency" of the vehicle compared to other ICE vehicles. That's where the Wh/mile makes the most sense for the EV ( I am purposely for now avoiding discussion of hybrids ... added complexity ), or its inverse, MPK. (However, tdelta1000, you should say MPK=Miles-per-kWh, not Miles-per-kW.) From a real-world practical perspective, the MPG helps the ICE driver learn about the car's fuel efficiency, which (at least in my mind) is immediately translated to economic efficiency, assuming a certain price-per-gallon for the fuel the car uses (diesel, premium gas, regular gas, etc at -- let's say -- $3/gallon). So ... MPG tells me how many miles I can go with $3 in my pocket (at today's gas prices).
For the EV its MPK would tell me how many miles I can go with <insert you home electricity price here> ... 16 cents. The $0.16 will likely not fluctuate as much as gasoline prices ... and unfortunately $0.16 is such a "small" amount it is not very relatable to $3 spent on gas for the ICE. But I could simply multiply the MPK by 10 or 20 ($3.20) to get some reasonable comparison "RANGE" :wink: to that $3 spent on the ICE.
( I am ignoring the difference here (but it should not be ignored for an in-depth MPK ratings discussion) of the actual electricity (think $s from your pocket) fed to the EV to charge it (including miscellaneous inefficiencies, cooling, heating, etc) versus its Wh/mile used while driving. )