You are getting a bit mixed up, and its understandable.
Essentially Phaedra was trying to equate fiel costs between an EC and ICE vehicles and using the cost of a gallon of petrol as a denominator.
He is correct, petrol is about £6.50 to £7.00 gallon. My last ICE car managed 33mpg over 3 years, so yes, i would get about 33-40 miles on £7.
Phaedra is also saying that 40 miles in an EV cost him 75p.
Hopefully that makes more sense to ya. It is difficult trying to equate 2 different systems.
But it boils down to this. Filling my tank in my ICE car cost £70.
Filling the tank on my EV cost £7.
Certainly the ICE car had 20 more miles capacity than the EV.