VBH the other day was wittering about the new electic Smart. One of her comparison tests was "miles per £"; she put the lights and other electrical loads on in the petrol model and suggested that "this won't make much difference with the petrol model but will make more difference to the electric one"
Sorry VBH but you're talking out of you pretty little a55.
The electrical power (say 200W) used by a petrol engined car will be generated by an alternator which has, as we've already discussed, losses, which is turned by an infernal combustion engine which has much larger losses.
The electric Smart will use this power from it's batteries directly, with tiny losses.
OK, I realise she was talking "miles per £" and not "miles per Joule"
I reckon.