Doubt it. Need a certain amount of Watts to push against a certain amount of air resistance. Easily calculated. For an econobox sedan or Tesla3 maybe 20-30,000 Watts at 60mph. Just guessing for a TJ probably about 55,000 Watts. Whether it's generated by one cylinder or 16 cylinders is maybe a 20% difference max, probably more like 10%, all else being equal. 16 cylinders have more internal engine drag losses mostly.... plus the energy needed to just compress air, and pull/push it past the valves.
Also why engines are measured in horsepower instead of Watts is just stupid.
You aren't going 60 mph in a TJ with 6 hp. The point of the small engine is to better match the engine's efficiency curve, which needs a fairly heavy load, with the car's, where optimal speed is around 25 mph. Obviously this wouldn't be a practical car, but it would get great mileage.
And horsepower will always be cooler than watts. Chicks dig horses.
