I also don't think it's fair to compare the 1966 Batmobile to the Tumbler. The 1966 car was made in like 10 days, and basically slightly modified an existing concept car. The movie Batmobiles were all designed from the ground-up to be what they are on screen.
And, Therin is right, as with most movie props, there's no one Batmobile from any of the movies. There are usually several, some designed as "hero" vehicles with lots of detail, and others mere shells designed for specific kinds of shots.