gingerfold:
A couple of points to add. Firstly I saw my first Tesla car on the road the other day, so not that common yet. I read that the battery for a family sized Tesla car weighs about 600 kg (12 cwt in old imperial weights), so what is the battery for a truck going to weigh?
A 238 kwh battery also costs around $20,000 and costs around 15p per kwh to charge even at present untaxed domestic electric prices. 
Remind us what the energy content and cost of a full truck tank of diesel is including the price of the tank and road fuel taxes. 
