The Volt gets advertised as having a 40 mile range.
It's predecessor the EV1 was directly based on a prototype vehicle created by AeroVironment called the GM Impact.
It got 160 mile range back in the 90s.
There are companies converting the Scion Xb to electric and getting 140 - 180 mile range. It's a four seat non-aerodynamic brick.
With the resources GM has, they had better figure out how to create a four seat vehicle that Americans would drive, that gets at least 200 miles on a single electric charge, or just give up now.