 I have unintentionally redlined this vehicle many times as the engine as far as I can tell does not sound like it is over revving even when the rpm's are in the redline This forces me to inconveniently keep my eye on the tach more often than in a car with a conventional engine. I do not get the advertised fuel economy which was low in the first place when compared to a car with a conventional engine for the same h.p.