Because even though the average American drives less than 40 miles a day, they will not buy something with that low of range because the average American still takes longer trips fairly frequently.

I mostly ride a motorcycle and barely drive my car. When I do the average trip is only around 10 miles. But every month or so I end up driving around 120 miles round trip. A 100 mile car would be pointless because I’ couldn’t even make that trip.