For example, Teslas are more expensive to maintain than the ICE industry average - $832 versus $650 for other cars. https://jalopnik.com/advisor/tesla-maintenance-cost/#:~:text....
In terms of fuel, well that very much depends on what happens to electricity prices when a lot of people start plugging in their EVs. Again, people assume they will just remain the same in response to an increase in demand, but color me skeptical. The only way electricity prices can avoid rapidly increasing is if it becomes illegal for you to plug in your EV.
You should in general be suspicious of anyone making claims about total cost of ownership calculations, and heavily discount such claims -- whether it is your local IBM/Oracle salesman or your local car salesman. It is usually a mechanism to justify higher up front purchase prices. Next time someone refuses to be price competitive with other options but makes an appeal to TCO, ask them to put that into writing -- that your TCO will be lower otherwise you will get a refund on the purchase price. Just watch their mouth drop.