The average mileage of an electric car varies entirely on the size of the engine and the type of driving. There is a huge range. For example, a small Honda Insight can got an average of about 65 MPG in a study involving 105 cars of that make and model. On the other hand, a Chevy Silverado Hybrid got 16 MPG in the same study involving 3 cars of that make and model. There were 5 cars, 3 Hondas, 2 Toyotas, that got between 45-48 MPG and that is pretty much the acceptable standard for compact Hybrid cars.