Bob's advice is good. However, even before you spend money on the rental, try pushing your seat in your present ride all the way back. That will at least get you started towards a solution. Mine doesn't cost you anything.

As I've stated in earlier postings on this matter I found getting my seat all the way back worked. In fact, it's a good thing the car has cruise control as I can just about reach the gas pedal (though easily hit the brake). Six hours driving that way and I was still able to get out of the Prius and go for a walk.