We need to be clear as to what constitues an infringing unit. Correctly speaking it is the microprocessors. But your calculation of roughly 1 cent per microprocessor x 100 per vehicle does work out to $1 per vehicle.
So $1 per infringing auto might be reasonable, if the unit is auto and not microprocessor. In any case, I agree with your estimate of what Ford should have paid.
Opty