[norwaypinesavage]

Wikipedia, if you can believe them, says 36.6 kWh per US gallon. (Sorry, I did the calculation of 40 in my head.) The useful efficiency of electricity is not 100% either. You have wires, chargers, dischargers, motors, inverters, transmission systems, regeneration for braking, etc. It's certainly higher than an IC powertrain, but no where near 100%.

[babygene]

http://hypertextbook.com/facts/2003/ArthurGolnik.shtml. It’s in kilograms so you have to convert...

motor efficiencies are over 90%. Chargers in the high 90s.

[Moltke]

...and then there’s the question where the energy to heat the darn thing in winter comes from. I figure you’d need a couple of kWs at least. So you’ll be driving slower or not go very far...