Well... I wasn't getting the greatest of gas mileage lately... so I was willing to try just about anything. Today I bought some Lucas Gas Stuff... Racing Formula... not street legal (according to the label) but I wanted to try it anyways. It says to use at every fill up (which is kinda weird because it's not street legal) and it states that it increases MPG, and all this other crap. Well, I put it in, and there was a slight power difference, but it seriously increased my MPG. As of right now, I'm getting approx 150km more per tank, and I was driving it harder than I normally do. I would recommend that you try it... if it doesn't bother you that it's technically illegal to use on normal roads.