Although I'm sure a lot of people wouldn't know because TR is not exactly a vast tech source...

My xA has very short gearing. This is combined with an engine that needs to stay within 3-4k rpm to make the car somewhat quick.


My question is this: Is it unsafe for an engine to constantly see those types of revolutions? On the highway, cruising at 70, the engine is turning at about 3700 rpm, which is somewhat "high".

How would this affect engine longevity? A lot? Barely at all?