Why do you claim 56,170 is below average? What is the average?
In any event, a 2.8-liter Fortuner burns significancy more fuel than for a MG ZS, so even with the extra cost of petrol vs diesel, the MG is much cheaper to fuel.
And again, the numbers are based on getting electricity for free, which is not really possible unless you are stealing it. Even if you charge using only excess solar (not likely), you still have the cost of the solar installation to consider.
I'm not knocking EVs, I am probably going to buy one in April, I just don't see the cost savings being as great as they seem.
Of course, the more you drive, the more you would save. Before I retired, I was driving over 60,000km a year.