Dave Liquorice wrote:

Those figures don't look right 2kWhr (eh? a measure of power [energy use
per unit time] not energy, joules is energy) to shift a tonne 6 miles at
speed. And what about the (in)efficiency of the internal combustion
engine? You may be putting 7MJ in but you don't get 7MJ at the wheels.

They're not right - the gross calorific value of petrol is ~10 kWh per
litre, not 2.

--
Andy