On 30/03/2016 23:16, Roger Mills wrote:
OK, can we agree on this?

In a given gear, the maximum rate of change of road speed will be
achieved at the engine's maximum torque speed. The road speed at which
that occurs will be determined by the engine speed and the gearing.

At a given road speed, the maximum rate of change of road speed will be
achieved at the engine's maximum power point. The necessary gear ratio
to achieve this will be determined by the chosen road speed and the
engine's maximum power speed.

Yes or no please - no equivocation!

Yes.

(Well - almost. You want the gear that gives you the highest possible
power output for that road speed. It's not likely to be exactly peak
except for CVTs.)

Andy