I do not think it is easy to make predictions. How much savings would be once first kid starts college depends of merit aid and jobs… (Our jobs are not very stable at this point. Both businesses were under water recently.) That would drive EFCs with 2 and 3 kids.
My question was pretty much in general, should we pay off house and car since all financial aid depends of savings even in situation when paying them against the logic (low or not interest rates.) However EFC never depends on your current loans. Administration of colleges cares less that you have to pay your house, credit cards and cars. They assume that all money go to college, but you cannot ignore your loans…