OK, so about 34 kWh/gallon of gas. A 20 mpg car would yield 1.7 kWh per mile; a 40 mpg car would yield 3.4 kWh per mile. Converting that to km yields:

So a generic car is more efficient than a train car? I suppose this makes sense since a train car is much heavier. But trains are, in fact, more efficient because one train car holds dozens of people while an automobile only holds around 5-6 people, and frequently less.

Interesting...