True. I think think electic vehicles are in their infancy. If/when lithium batteries become viable, then the weight paragram might change. Although different, I fly RC airplanes. 10 years ago, electrics were a niche market. Now, every Hobby shop, Walmart, K-Mart etc. has them. The performance, cost/weight of batteries, everything has changed.
I'm not saying diesel is dead (I hope not, it keep shoes on my feet). Presently, I don't see the cost as being practical. Niether was ABS, or air bags originally. I do agree that the accounting of mpg might and probably is deceptive on these vehilces, ie Chevy Volt type.
Also, I'd rather put my hand on an eletric motor, than the exhuast of an ICE motor. HEat loss is every loss. Check out semi adiabatic motors.
Tom