Worked this out this morning, thought it might be of interest.
One B16B, one B18C. At 100,000 miles at an average of 50mph, both have been running for 2000 hours, or 7.2million seconds.
At 4000rpm, a B16B has a piston speed of 10.3m/s. That's 74,160km that the piston has travelled over that...