My son is starting to tire of his 1993 Civic with 300000 on it. Not sure why. Anyway, he is looking at a 2013 Mazda 3 hatchback. I have read on a number of forums that these vehicles are prone to rusting. The original owner of the vehicle must have felt the same way as she installed an electronic rust control module. I don't think this will persuade him one way or the other but it got me wondering if there is any science to back up the use of these devices especially in snowbelt regions.