I've completed my first trawl of the Road Car Forum to move appropriate archived threads here. Here is an interesting (but brief) thread on the subject:-
http://tentenths.com/forum/showthread.php?t=8231
For those who wish to see the old threads moved here, just go to the 'Display Options' box, at the bottom of the page, select 'Beginning' in the 'from the' box and then hit the 'Show threads' box.