Might be a misprint. If you substitute mph for the kmh schedule, it comes out pretty ok for just cruising. Replace KTAS (knots true air speed) for the mph schedule, maybe.More garbage from the owners manual. Shift into top at 60 km/hr?
I consider that to be lugging the motor. It is just not happy accelerating in top at such low rpm's.
And speed does matter. Higher speed = more wind resistance.