#### Re: It doesn't add up

OK, I'll bite:

[FYI, Tesla quote "around 1c/mile", assuming off-peak electricity]

1) Off-peak electricity is arounf 2.7c/kWh in the states, so 1c buys 0.37kWh

2) 0.37 kWh = 1,332,000 J/mile

3) Let's take a petrol car:

30 MPG is 9.4l/100km

1 litre of petrol contains 10 kWh per litre

So we're using 94 kWh/100km

Or 1.5 kWh/mile

Or 5,400,000 J/mile

Conversion efficiency is around 27%, so at the wheels we need

0.27 x 5,400,000 = 1,458,000 J/mile

4) Scaling that back up to get a "MPG equivalent", that makes

1,458,000/1,332,000 * 30 = 33 MPG

Sounds perfectly reasonable for a little 2-seater car.

How on earth do you get to 160 MPG??