Canada needs the money selling MTBE to the US or NAFTA will get us.
The oil companies are forced to use it and so they get sued...not the Gov or Canada politicans for forcing us to keep using it.
And of couse the enviromentalists love it. Gasoline spilled from jet skis sits on top of the water and evaporates; with MTBE in it it coeleces with the water and contaminates it. Therefore they can ban watersports as shown Here
I remember reading some time ago that MTBE is a waste product (hazardous material of course) that the oil companies had to dispose of in a costly manner.
What better use to put it to then to add it to the gas and make millions of $'s from it.