Yup, they be useless
,,,,and you are not alone, this has come up on automotive forums I belong to in the past as well.
See thread below (and links to other stuff in post # 31)
http://www.canadianrodder.com/forum/...ead.php?t=9842
more....
http://www.canadianrodder.com/forum/...ad.php?t=12122
good info in link in first post
http://www.canadianrodder.com/forum/...ad.php?t=10554
direct to link mentioned above
http://trueler.com/2010/09/13/ups-br...ting-avoid-it/
James