The Tesla is a toy that seats two and won't even pass a 3-mph gov't bumper test. The Volt is a real car that seats four/five and won't leave you stranded when the batteries are depleted. The Volt is also projected to cost about a third of what a Tesla costs. How can you be impressed with one and not the other?
Personally, I have a lot of respect for GM for bringing the Volt to market. Yeah, I'm leery of the "230 MPG" figure, but I understand that calculating equivalent efficiency for dual-mode hybrid vehicles is going to be difficult. If it really can go 40 miles on an electric charge alone, my wife and I could both commute to work in one without ever using a drop of gas, which seems pretty significant to me.
What I'd most like to know is how heavily that projected range will be affected by things like ambient temperature, a/c usage, etc. 40 miles on a charge is great, but if that becomes 20 miles on a charge in 100-degree temps with the a/c on halfway, then not so much.
I'd also like to see what the projected city/highway mileage are when it isn't operating in pure electric mode.