Ah yes the magic snake oil of cars. Just like some of the ridiculous speaker cable "snake oil" products. Buy our "$100+ a foot" (No joke) speaker cable and you will notice significant acoustic quality gains.
If gas additives were effective for performance/efficiency gains, much like other products of its type, the product would not be lurking in the dark corners of the market looking for buyers, but would instead be in your gas already or regularly sold to every customer at the gas stations. If it sounds too good to be true, it is. When in doubt research the hell out of it.
eLzar: Yeah some times I get nostalgic for the old Couches of Death, the coffee table with the Sphere/Pyramid/Cube that we often played Epic on, and the warm sleepy afternoons in that room. I also truly miss a more spartan style. The special lady friend likes clutter and our apartment reflects that.
D>M>