If I were in the market for an ELR again, I'd try to find one with the Kona seat package. The leather is softer, and having a two position thigh extension cushion is handy for us folks over 6ft 2. Also, there are adjustable side bolsters with the Kona seats. Dead pedal placement is much better in this car than your Volt. Short story:
Had to drop of my car for service a few days ago..
Had a loner XTS 4 with the thigh cushion in the seat bottom for a couple of days, and it made the car much more pleasant to drive if you have long legs to give them some extra cushion. It's almost Barca lounger comfy.
After two days with the XTS, I can say it's a pretty nice car. Very roomy back seat, and all of the door latches light up at night when you unlock it. Handles well for an all wheel drive car.
I have no problems entering or exiting my vehicle. I drove a Volt for two years so I can say that seat comfort is a non-issue. Your back will thank you for the ELR. Long trips are a piece of cake. Try to find a car with the Kona package and the full-range adaptive cruise control. Good luck!