First a short answer: My preference would be to re-process cars only by member request, and to leave the output at the nearest 5 pounds. I'd further document the assumptions with which the process was applied (e.g., engine power multiplier) and make those figures available to the membership.

I honestly think that the current process (more on that word in a separate post) is pretty damned close. Most of my questions about it are academic (i.e., probably unhelpful) rather than intended to fix some major problem.

K