I do not see how the estimated costs for transportation can mean anything since they typically give one estimate for all eg “out of state” students, but you might be coming from almost anywhere. Our of state could be a five mile drive or across the country (or further if you are international).
Otherwise the estimates have been pretty good in our experience. However, you need to live quite frugally to meet the estimated costs. I think that it is always valuable to have a little extra money ready just in case.