Has anyone heard of this?
http://www.gas-king.com/
My brother has it on his Mazda 6 and he said it helped a bit. I want to try it on my Alero to see if there is a difference. I want to know if it works or if its just another gimmick. I get around 248 miles on a tank of gas with mixed city and high driving with my 3400. I usually do around 74 miles on the highway if conditions are good.