By the time we went our separate ways back in Bristol, the milometer read 97.6 miles.
From the thisisbristol.co.uk
In countries where Imperial units or US customary units are used, it is sometimes called a mileometer or milometer, or, colloquially, a tripometer.
From the en.wikipedia.org
Like kids in the back of the car waiting for the milometer to click over, this is the reason the doom-mongers have picked out December 21 next year as the end of time.