My Craftsman is rated at 195 mph, and does a very good job of blowing water out of cracks, mirrors, etc... I found it is great for my black plastic grille to prevent water spots on it, and my tires.
I don't use it to blow dry the entire car. I use a WW first for everything I can get to. Then I do one trip around the car, blowing all moldings, cracks, mirrors, handles, and rims/tires. I then get my WW again, and walk around one more time to get any drops blown out on the surface. When done with this, I then wipe out door jambs, and my tires get dressed.
Makes drying easy and efficient. Also makes neighbors wonder about my mental status, but I've since explained the reasoning to them, and they "understand".
I avoid driving my car after washing until it is thoroughly dry. I've found driving a wet car allows the dust/dirt kicked up from the road surface to stick to the wet surface. And if one were to finish drying it when they get back, they'll be grinding that dirt in to the paint, marring the surface.
Dave