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Go with the 22s - they make no difference and are NOT run flats - so better ride than smaller wheels that are RF in my view. So long as you have the air suspension the ride is a dream.
Just back from 1,000 miles to Spain - great car for pounding the miles although lacks the excitement of course of the Panamera (wife's car). The X5 is quieter though.
Am questioning my driving as I have not managed to get the mpg above 23...even on the long motorway stretches it is not getting anything like the 28 (and I know we are both talking UK metrics). Something to look out for.
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