Peter, thanks for providing the extra detail. good to see that there seems to still exist some grey areas in legislation...(-:
As far as my memory allows my +8 sits at circa 2500rpm in 5th at 70mph purring along reasonably quietly, other than wind noise..(-: In reality noise production on my old Mog depends upon not just the revs but the amount of throttle pedal pressure applied to get there..(-: