> The obvious method to audit compliance against an emissions standard is to use the same test that the regulator does. Sure, but those folks also have common

> The obvious method to audit compliance against an emissions standard is to use the same test that the regulator does. Sure, but those folks also have common sense, and experience. If engines with comparable power have 40x more emissions, you'd do well to understand where such a huge change comes from. I've done some measurements as well as simulations in physics, and one of the first things you learn is to be suspicious of outliers, both of results that look like total garbage but shouldn't, and of "too good to be true" results. The only way not to raise a red flag would be if all of the compliance engineers were new at their job. And that itself would be suspicious too.