auto overdrive problem
That's nothing to be concerned about....90kph---56 mph it will go in to O/D and run at maybe1800 to 2000 rpm. Perfectly normal. There is probably a way to turn if off look in owners manual if you prefer a faster engine rpm at that speed
http://www.autodealertools.com/quickQuote/manuals/2007/XL7.pdf If you don't have the manual you can download it there
Search Suzuki XL-7 Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Suzuki XL-7 Experts