one of the best was done by VW they went from a 14mm nut and bolt holding
everything down to a 13mm size.  this was done in about 1960 and saved them
millions  later  mark d

In a message dated 4/6/2012 3:25:09 P.M. Eastern Daylight Time,
Rubatoguy@COMCAST.NET writes:

As it  was explained to me once, saving 5-cents on a car seems trivial.
But when  you multiply that by the cost of the entire production number
of the  vehicles made, you are talking about real  money.