The touring seat is a little bit higher than the stock seat, but it is softer, and so I can actually put my full foot down on the ground. I couldn't do that with the stock seat. I think the Grandvista was made for short people with short legs. I am 5'2", and it fits me great, including the distance to the highway boards. If your inseam is 26", you may not be able to put your entire foot on the ground, but you should be able to put most of it down.
I had a SYM RV250, and a Suzuki Burgman 400 before I got my Grandvista. Even though the seat heights were a little bit lower than the GV, with the touring seat I can reach the ground much better than I could with the other two scooters. And the 359 lb. weight makes the scoot easier to control at stops.
The GV with the touring seat is the best 250cc scoot I have found, and I feel 100% in control. I never felt that with the other scoots.