Originally Posted by hillrider

The MPM and the 5M, 10M, 15M, 20M and 25M thresholds don't change; the TPD comes into play when you calculate the cumulative TPM, from which you deduct the TPD before comparing the result to the MPM and nM excess mileages. So, in other words, the TPD * % of excess mileage is not part of the equation.

Short and hopefully clear...