Designing and building 2 drivetrains and mashing them together is expensive. It's a small miracle that the Prius is the price it is. I think the options are fast, affordable, fuel efficient; pick 2.
The BMW i8 gets nearly 30 MPG on gasoline alone, with a 0-62 MPH time of 4.4 seconds. Nice hybrid sports car.
https://en.wikipedia.org/wiki/BMW_i8
