Also from baton rouge to shreveport it tries to avoid all interstates. Yep, I have to force it with via points. Are tomtoms different? I can still return mine.
I certainly would return it and can almost guarantee you will see the routing you expect on a TT. Good luck.
Mine started doing the same thing along with the other problems with the 3760T ... even though fastest route was set it start going to back roads. Garmin just notified me that the unit is bad and they are sending a new 3760T.
Just got a Nuvi 1490 LMT the other day because my Magellan 1470 got stolen.Let me say before I go on: I love Garmin, they make great aircraft GPS'.However, as this thread is about, routing sucks bad for their land based GPS systems.-----------------------
On the 3790 you might also try turning nuRoute off and compare the routing. It can make a big difference. With nuRoute/trafficTrends active my 3790 wants me to take ridiculous routes on little neighborhood streets in Philadelphia instead of the obvious main roads.
And still other times it will turn red and won't do anything so I have to hit the "Detour" button and then it will route me a different way.
I just find it odd that what is likely the top GPS, at least in USA, in terms of popularity, doesn't have more complaints about the basic routing scheme?
I'm pretty certain the routing in all the Garmin's (or TomToms) at the same software level is apt to be the same so that's not an option.
P.S. Is your older Garmin using the same maps as this new one?If so, they changed the algorithm some how and managed to screw it up.