I had, back in the late 1960s, an early 60s 4-cylinder, 2-cycle SAAB. I'd pull into a gas station and say, "Gimme a quart of outboard motor oil and 7 gallons of regular." Had a pull knob in the dash to adjust lean/rich. When stopped, you had to keep it going by revving with the accelerator.
Sounded like a chainsaw gone beserk, so all of my pals knew when I arrived on the scene.
Had a flywheel (?) that one could disengage going down hills so that you'd just coast and save gas. On the downside, when it rained, one of the cylinders would conk out, which made for a rough ride.
Also, unusually for the day, had front wheel drive. I used to like to show friends how quickly it could go around corners...
Rolled it one night doing that, a block from the local police station, winding up on our side in a fraternity house yard, engine screaming away. We got out using the driver's door like a submarine hatch.
The brothers came running out and, after a brief consultation, righted us. Bracing my feet against the tire and my hands on the fender, I pulled the front driver's side fender outta the wheel/tire, and off we went again. Windshield was busted some, though, and when I called the police next day to ask if it would be okay if I just wore goggles and carried on they said, "No."
Sold it to my buddy for $50...