How is that relevant to nub of the argument?
So far the best guesses we have for annual mileages in NA and UK ae@
UK - 12 000 miles US/CA - 12 000, possibly 15 000 miles.
The only way to determine whether mileages in NA are very significanlty higher is to try to find firmer evidence for these numbers.
If, for example, the 15K figure is confirmed for NA and the UK figure (not "Europe", another thing altogether and of no meaning) turns out to be 10K, then we have a clear difference.
I had a quick look on Google for a UK figure but was unsuccessful so far.
I also checked the rest of this section of this thread and I could only see a pissing contest but nationally or regionally valid averages. The comment by one poster about considering miles per person is interesting (rather than miles per car) but may not add much. It would certainly make the search for data harder.
In my own case that might add maybe a guesstimated 25 - 30% to my (very low) annual mileage (small is beautiful) because of journeys in rented cars.
DAS
For direct contact replace nospam with schmetterling