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I still am looking for any known mechanical differences that need to be adjusted for when purchasing a car in western state and driving it in the Midwest.

Does anyone know if there are regional differneces in the way cars are setup? Does a car shipped to a dealer in New Mexico have any different engine tuning than a car ordered or shipped to Illinois? I know there are differnt "option packages" available depending on where you purchase, but what about the drivetrain? If there are differences, are there any modifications my local dealer would need to do to have the car operate better in Illinois, if purchased in New Mexico.

I am curious what everyone driving an ES330 is getting. My 05 has less than 1000 miles on odometer, and I have not gooten better than 21mpg on average. Will mpg improve as car becomes broken in? I got 22.5 to 23 with my 97 ES300.