Generation 1 Volt (2011-2015)
For those curious about real world results, here are some real world numbers and anomalies.
Did a 3,800 foot climb (all electric) in my 2013 Volt (No Ohms) over a 12.5 mile drive.(San Bernardino to Lake Arrowhead, California.)
I have it detailed for every 200 feet of elevation change.