Reduce a complex equation to only two variables ? But that's no the point : expecting fairness isn't practical anyway. :) I'd bet the practical response will be

Reduce a complex equation to only two variables ? But that's no the point : expecting fairness isn't practical anyway. :) I'd bet the practical response will be people stretching their car's lifespans way beyond reasonable, pushing them to new extremes of decrepitude and unsafety. There's also no police anyway to keep that in check.