Finance calculators possible error's
How come the financed calculators CarGurus.com and Cars.com come up with different monthly payments with all the same input data? It may be only $6-$8 on $250 monthly payment but it could keep someone from wanting to buy a car.
I have no way of knowing. Perhaps the calculators use a different set of assumptions about rates, loan terms etc. Obviously these are just a guide. For a reality check apply for a loan and see what the lender is going to charge you.