What you describe is called a hybrid. Hundreds of thousands of them on the road already. A gas engine, a generator, a battery, and electric motors. There are different ways to do it, but those are the main components.
Our Toyota Highlander Hybrid is a mid-size SUV that goes 300+ miles on eight gallons. NObody does hybrids as well as Toyota.
And we should be going Hybrid, not EV.
