I'm 6'4" and I fit fine. I'm not sure if I would with another 4 inches. Depending on how he is proportioned (torso length vs. legs) he might find insufficient legroom or headroom, or both.

The only complaint I have about seating is lack of adjustment of the seat bottom for height and angle. The result is lack of thigh support. I have an Obus Forme seat cushion to compensate. It seems to do the job pretty well.

Presumably he will test drive it first. That might tell him right away. If not, you might consider renting one for a couple of days to get a good sense of how comfortable he will be after sustained driving.

Jim

Lifetime fuel mileage:

After learning how to hypermile: