An electric crate motor you can drop into your car
This sounds great for a small 4 cylinder vehicle - until you start thinking about most cars today only have power steering so a manual steering box isn't available. Then you need a 12V battery to operate most of the lights, speedometer, radio, etc. What do you charge this with? If you do a step down transformer there's more of your range eaten up. Then there's other power stuff: seats, wonders, wipers and roofs. More range bye-bye. Sounds like you would still need some other power source to make all of the modern creature comforts in a standard ICE powered vehicle operate.