Aside from the horribly optimistic interest rate projections in the "[Drive Free, Retire Rich][1]" video, is this a plausible way to deal with auto expenses over one's lifetime? [1]: http://www.daveramsey.com/article/drive-free/ The basic plan is: * get off the treadmill of buying a new car on credit every six years * don't trade your old car for a new car; instead: * save money for a year until you can buy a slightly better used car * do the same next year and you will have a reasonable used car and no debt * save all the money you would have spent on car payments compound in a mutual fund * withdraw from this fund every six years and you'll have a new car "for free" * after 30 years the fund will reach a million dollars With the assumptions: * 12% after-tax average return on mutual fund investment * saving the US average monthly car payment of $425