This is not an issue of believing one thing vs. another. The results are not 'theoretical' they are measured under defined conditions. It is not unheard of to have conflicting data in the literature. I have seen it a couple of times. Test methods, and therefore, results can vary. I do put more faith in peer reviewed journals because the burden of publication is quite high (BTDT). Much higher than your typical advertising study. Obviously, these were atypical, worst case conditions but that is how the real world tests for them. The article compares the technology as it was when the vehicle was stock (air filter, crank vent filter, oil filter). Some folks are still running around stock or nearly so; so it may be of interest to them. I don't know why you are so enamored with KnN but oil wetted mesh it is not. I wouldn't run a KnN but that is a different issue.
