I have written a few reviews for Tripadvisor. Some for places in France, a few for the West Country and a scattering in other locations. As well as earning a batch of meaningless "badges" (little pictures that appear when I satisfy my vanity to look at my profile on their website), they tell me I have incurred 232 miles of travelling.
Now I last studied geography at school and I don't do much by way of sums these days since I gave up the day job, but surely, M'lud, even one trip to Penzance will amount to some 280 miles? If you simply added up each journey from home to each place reviewed it would amount to well over 2000. Obviously TA has some other, secret, method. I cannot imagine what it is.