EV1 got 60-70 mile per charge.

"Limited range (60-70 miles) and reliability in the first EV-1s to ship, but better (110 - 160 miles) later. Research says the average driving distance of Americans in a day is 30 miles or less and that 90% of Americans could use electric cars in their daily commute... an engineer explains that, as of the interview, lithium ion batteries, the same technology available in laptops, would have allowed the EV-1 to be upgraded to a range of 300 miles per charge.

What's the point of using a gas engine?

An engine that still pollutes, makes noise, requires maintenance and breaks down.