I'm not saying moderate speeds are better necesarily, but that cars which are so sophisticated like the M3 and various Porsches etc, lack the sensation of speed until well into triple figures.
My tongue is firmly in my cheek when referring to your 'duff' car. I'm talking cruising on wide open roads, like motorways and dual carriage ways, where you just want to end that section of journey as soon as possible, not the smaller roads on which the Three Wheeler is so much fun to drive on.
Effectively, I suppose I'm saying that the Three Wheeler is quite capable and willing to cruise at 4000rpm in 5th should the driver want to.
