To be honest, I've never gone to the trouble of an exact speed conversion, just a rough one (ie) 60 kph = 6.0 X 6 = 36mph....70kph being 7.0 X 6 = 42mph so 35 & 40 respectively were the figures we've worked on which explains the discrepancy.
Other nasty symptoms we get which is possibly a combination of heat and use of incorrect fluid is hanging on in top gear which can at times also stall the engine just as driving a manual without dipping the clutch when you stop will, yet top is the only gear it will stick in. This was another symptom that was partially adjusted out of the system via the kickdown.
When you get right into these things, you find that kickdown adjustment is the most critical of them all and controls more than just the kickdown. Once sorted and using the third gear in rrestricted speed zones makes them a dream to drive.
Speaking of heat, I sent Jon a pic of the thermometer in my Xantia taken on that trip a couple of months back that hopefully he might downsize and post one day out of interests sake. If nothing else, it helps clarify the problems we can have with it on some mechanicals and plastics.
Alan S
By the time you're old enough to know it all, you can't remember why you were learning.