Originally Posted by FBinNY

Of course they can and should make their own decisions, but having some information on which to make those judgements always helps.

Charts like this are only guide lines, as are the various rules of thumb for seat height, stem length, etc.

Despite the shortcomings (I find the values to be low for wider tires) the article and chart do show that wider tires at somewhat lower pressures can have lower rolling resistance than very narrow tires at very high pressures. It also shows the relationship between pressure, width and axle load. All in all it serves a valuable purpose -- as a starting point, but like anything else, shouldn't be taken as gospel.