[sokoloff]

No. 300 Watts / mile * 55 mile / hour leaves you with 16500 Watts / hour, which is a non-sensical unit.

On the other hand, using the correct units (300Wh/mile):

300 Watt * hour / mile * 55 mile / hour = 16500 Watts [a sensible unit] (or about 22 horsepower which is reasonable for a steady 55mph cruise).

Do that for an hour, and you get 16.5kWh of energy consumption and cover 55 miles, for an energy efficiency of 3.33 miles/kWh, which is in the ballpark (albeit low) for what my LEAF delivers (averaging a bit over 4 miles/kWh at average speeds somewhat lower than 55 mph)