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You can go here: http://www.remcotowing.com/ and then click on Application Charts, then select your make and model and it will give you the answer. It depends on whether or not you have an automatic or a manual transmission.
IF you can tow 4 down, the mileage doesn't accrue while you are towing.
I just bought a 2011 sonata and will tow it in a KarKaddy tow dolly.... Bought used ss460 for $1400... about the same price of a base plate and braking system....