x-valve efficiency

[afrankart]

Which is more air efficient, a classic valve or an x-valve? I've heard that level 10 uses lotsa air.

[Bulldog]

L10 doesn't really use that much more. It's almost insignifigant. I suppose a classic is a little more efficient, but not by much. If you got the bux to get the X valve, go for it, you won't be soory. Also, there's more detailed info on this if you do some searches.