Different routes

Rev Jack

I have a 1515 and 1535 both set for usa. trying to go to perry ga. when I open both units within 6 inches of each other I get one with a route of 6:34 363 miles and one with 5:54 322 miles. settings same on both. when I change to alternates I get yet a third way plus one 5:54 323 miles

dhn

Are the maps both at the same level? Might reflect the IQ routing data being different on the two maps.