I have a 2001 gls 2.0 5spd that I am stilling working on the first tanks of gas so I can't say how efficient it is yet. There is 159K on it when I bought it last week and Ive been doing some searching on the Hydrogen supplement. Has anyone had any experience with the installation on your Elantra or any other model? Sure sounds like it could make a difference. I drive 124 mile a day and this could really make life a little sweeter if it is for real.
thanks
tom