I drive mine flat to the boards. Not really concerned with engine longevity or economy that much. Yes I service it and look after it but if it lets go I'll just get another one and away I go again. Thats the beauty of rover V8's. Cheap as chips and there are heaps of them around. 
As far as changing gear go's....usually around 3500rpm but 4500 isn't unusual. Thats not really all that high anyway and I reckon it drives alot better when you're ringing it's neck. Sounds alot better too!
Cheers
Mick
1999 Land Rover 110 Defender TD5 Cab Chassis
1985 Land Rover 110 County 4.6 EFI V8
1993 Track Trailer camper
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