I think 750 rpm is standard & it can't be adjusted - except via mods to the engine ecu.
Have you tried checking with a diagnostic tester as the instrument panel is probably not an accurate indication.
If it is high, might be worth checking the intercooler hoses for splits and have some check the MAFs for faults. The engine could be getting more air than it needs for a correct idle or thinks it's getting more air.
The standard idle speed does also seem higher than expected, but is probably set to maintain emmissions or make sure there is enough output from ancillarys like the PAS pump, alternator etc or even make sure the turbos speed up quicker.
Older design na petrol v8s definitely could idle as low as 500rpm. Paul,
2001 Discovery 2 TD5, 211,000 miles & climbing
2006 FFRR TDV8 Vogue 151,000 miles & now sold
Member of Midland (Land) Rover Owners Club, www.mroc.co.uk
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