interesting - and bearing in mind this experience is only a couple of days old, but... the engine actually doesn't feel settled at around 60mph i.e. approx 2750 rpm - almost as if it's straining, then at 3250/70+ mph it settles back into a comfortable growling which doesn't feel at all as if the engine is under any strain, and which improves as you apply more rpm to the system. Also... at constant accelerator pressure in say 3rd or 4th the speed comes on in layers, so there is a lag phase of about 1 second before it engages at the next level in passing the energy through the wheels, so the physical acceleration also follows this multiple plateau model. It is non-linear, but the lag periods seem to last about the same time - maybe about 3 of these plateaus up to maximum rpm. maybe this is the flywheel? If you floor it, you obviously don't notice them.