Comment Re:Efficiency check (Score 2) 359
That's a good explanation.
The other problem with rotary engines is that they're rare and therefore a lot of mechanics don't know how to work on them. In some areas, you're pretty much limited to going to the dealership for service, which is usually a lot more expensive than an independent. So in a nutshell, they might make more power in a smaller space, but they cost more both in mileage and maintenance.
Their big advantage (at least, the big advantage I perceived back in the 80's when I was drooling at the RX-7) is that because the engine can be smaller, the whole car can be lower, because you don't have to have the hood as high as you would to cover an equivalent-power piston engine. That advantage has been negated by all the pedestrian safety laws which require the front end of a car to be high enough that if you hit someone, they won't cartwheel into the windshield. Since the hood has to be that high anyway, you don't get any stylistic advantage from a more compact engine.