The cabin of a Morgan is not the quietest of places especially at higher speeds , it very noisy from the wind, exhaust, engine etc, I have a 2litre Duratec and find it can be tiring at higher speeds especially with the hood up over long distances, I doubt the addition of a 6th gear would make it a much calmer or quieter or more comfortable or more economical place to be at speed.
Whilst the Morgan is capable of much higher speeds I doubt I would want to explore it too often.
