[fnj]

> a Tesla uses about 300 Watts a mile @ 55 Mph

This is nonsense. The dimensions are wrong. Watts are instantaneous power. To be meaningful, you would have to give either kWh/h or kWh per mile or km.

Besides that 300 W is only 0.4 hp. Sorry, but that is just not credible.

[madengr]

Just for reference, I average about 4.5 mile/kWh in my Leaf.

[aunty_helen]

Not to dispute your claim that it's low, but the physics checks out. The cited link saves me explaining it: >Reports are 300 W/mile at 55 mph. If you do the product of these two numbers (300 * 55) all units but W will cancell eachother out so the answer is 16500 W = 16.5kW

The time component being on the mph allows the conversion.

[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)

[averagewall]

That's not obvious. Why @ means *? And what does W/mile mean?