I am happy to have found your bumper stickers about driving 55 to reduce CO2 emissions/global warming.  I started driving no more than 5 miles over the speed limit a couple of months ago, and have been thrilled with my gas savings and I feel less stressed while driving.  The only problem has been other drivers, who are irate about not being able to go 10 miles over the speed limit, and when those big SUV's and trucks are tailgating my little sedan it is annoying and a little scary.  I was thinking I should design a bumper sticker to try to spread the message but figured I should google it to see if someone else had.  And you had!  

Many thanks,

Elizabeth Haywood-Niler