Source for the 6KWH
The 6 kWh electricity to refine gasoline would drive an electric car the same distance as a gasser?
but I'll agree that there are numbers both higher and lower quoted for this, partially depending on where the oil is coming from (shallow on shore wells, or deep offshore wells)
I also note that there are loads of sources rubbishing these numbers. However these "rubbishing" sources only look at the direct refining energy needs , and maybe the transportation energy required to get the fuel to the point of sale - they ignore the exploration and production costs of finding the oil, getting it out of the ground and getting it to the refinery.
If you download and open this UK government data base and then filter the result to list the energy consumption of vehicles in wh/km.
(I used this conversion: 300 wh/mile equates to approx 185 wh/km)
There are a total of 67 pure electric vehicles listed and of those, only 23 have consumption figures higher than 300wh/mile.
However, for the sake of argument I'll accept your figure of 300wh/mile.
Your 36 terawatt hours figure is totally misleading because it assumes that very one of those 20 million electric cars is going to be on charge at the same time.
You know that's not true.
In fact most electric cars are not even charged every day. An electric car with a range of 250 miles driven by someone who has the average daily commute of 32 miles would only need to charge the car once per week, and that would most likely be done in a single overnight session with the car charging at 7KW
The daily commute figure comes from the average mileage per year for cars (7600
Average Car Mileage UK 2020)
divided by the number of working days (48 weeks at 5 days per week)
Anyone not happy about the rise of electric vehicles is now going to be a bit more unhappy
Ban on petrol and diesel car sales brought forward
Note that this ban applies to hybrids and plug in hybrids - only pure electric cars will be available for sale from 1 January 2035.
I suspect this ban will not apply to commercial vehicles
Cheers
Bruce