This is probably the ultimate mentos diet soda rocket as when the guy fires it off it flies over a two story house and lands on the other side. In an additional video the guy shows how he uses only two mentos to get this soda rocket off the ground. He chews one up and puts it in the cap and then sticks another one to it. Once he has the cap on he knocks them down into the soda and shakes it up. Once it takes it out and throws it down at the street it blasts off. I'd assume that the reason less mentos makes it go farther is that with to many mentos in there it is either too much thrust or the thrust is curtailed by to many bubbles.