There is a web site that gives you the most direct route, approximate gas price and the location of tolls as well as the amount. It is applicaciones4.sct.gob.mx or google "route to route". I just plugged in Nogales, Son and La Cruz, Nyarit and got $1113 pesos for tolls. I do remember there was one toll that was 5 pesos different than the route site showed. Anyway, this was really good for route planning as well, as we could see about how many km's we could do in a day and check which cities were close to the driving route. Hope this helps.
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