Will fit != should fit.
Based upon my experience Tire Racks' fitment tables were built with maximum coverage in mind first, then with maximum accuracy for the major sellers second. They took a list of all cars sold in the USA, then filled in actual offsets where they had them, and guesstimated where they did not.
I'm certain they have the correct offset for most any Ford or Honda.
I doubt that they have the correct offsets for a relitavely unknown car of which only 12,000 were sold in North America, or other rare cars such as the Celica All-Trac, Mazda 323GX, Yugo, or BMW Vixen (mobile home).