first, they arent running at the optimum rpm, the electric load on it slows it down and most generators are rated such that when outputting their maximum power they are above the load when they would be most efficient and u better fucking believe that charging a car has it at its limit. Its still much closer to optimal than an ice engine in a car but certainly not optimal.

second and more importantly small generators like that are usually at most 18% efficient where as modern ice cars are usually a little over 20% efficient and then that 18% gets multiplied by the around 95% efficiency of evs so yeah no theres no fucking way that is more efficient. If it was even a small “portable” powerplant it would be a different story even a small gas turbine would be more efficient than an ice car, but not that shitty little thing.

and again theres no need to pretend, this is an extreme case that would only happen rarely even taking it into account evs are better (even tho they are still cars and therefore dont fix 99.9% of the problems with cars)