Actually to replace all the gas vehicles in the US, it is going to be around a 50% increase in grid use. You gain quite a bit of efficiency with the electrics. I don’t know about diesel. Right now it isn’t about making sure you get every oddball case. Even if Tesla gets it’s semi into production, you aren’t going to see it on ice road truckers anytime soon.
The Bolts/Volts and Tesla’s along with I would guess anything with lion batteries have temperature control for the battery packs as well as AC and heating for the cabin. It cuts down on range but it is there already. For the Bolt you get a pedal to the floor range at top speed of 93 mph is 160 miles.