US passenger embarkations are around 800 million per year. For business travelers, that's likely a car rental per 4 flights maximum (most of mine are one rental per two flights). For leisure travel, it might be one per 10 flights (families probably rent only one car and might be more willing to take connecting flights to save money). I think these are orders of magnitude more common in use case than car repair related rentals.
> But let’s take your use case, how many of those involved driving more than 300 miles per day? Or even total?
Less than 10% of them. We would sometimes fly into one city and drive around a country or into Fort Lauderdale, rent a car, drive to Key West, and make our way back over the following week. But even if I don't drive more than an EV's range, I would still need to be certain that the EV left Hertz fully charged and that Hertz was OK with me bringing it back empty. The former sure doesn't seem to be happening based on discussions in this page and if they allow the latter, the former becomes harder to ensure.
(I daily drive an EV, have for almost a decade, and love it. Even I don't want to rent an EV when I travel.)