Help me plan this trip

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next week i am driving from dallas, tx to portland, OR (more specifically grapevine, tx to eugene, OR). i have inputed this info into google maps/earth, yahoo maps, etc... but i know these services don't always show the fastest route, they simply try to find the shortest route. has anyone made a trip similar to this recently? if so, do you have a route you prefer? i am also looking to see some interesting things on the way, any recommendations would be appriciated. thanks for any help.