All the interior/exterior dimension numbers are from
- Manufacturer directly or
- Sites like MSN Autos or Edmunds
There was a question in the gm-volt forum about how I got the Leaf & Volt front/rear legroom numbers. I rechecked these number and they are correct.
As to why Volt feels cramped at the back compared to Leaf is an interesting question, given the official numbers. I think it is because - when Leaf front seat is set with zero height (to maximize headroom), you can't put the feet below the front seat and that reduces legroom.
1st Leaf : 2/28/2011 to 5/6/2013
2nd Leaf : 5/4/2013 to 3/21/2017
Volt : 3/25/2017 to 5/25/2018
Model 3 : 5/10/2018 to ?