I find speed depends on a multitide of factors, but most importantly what time of the year it is,
Winter i can cruise at 80mph all day long,
but in the summer i find a comfy 65mph tends to mean when i want to boot it i still have enough head room as it were to be able to,
I ignore pretty much every gauge in the van apart from the Oil Temp, that is what controls my average speed
I can't recommend fitting a decent Oil Temp Gauge and a properly fitted sender highly enough, 99% of the time if a VW engine fails it's due to excessive time at too high a temperature.
Oil starts to break down and degrade if you get it too hot and Oil is the key in an aircooled engine
:mrgreen: