Cleon
Legend
I think we are maybe talking at cross purposes. Since we're doing just a conversion of a single tentacle, I thought we want just the usual speed that a single tentacle would move at on its own. The 18 mile movement of the entire body should be some sort of "hyperdrive" that it doesn't use a whole lot, right?
On the other hand, it could move faster than the entire body, like legs moves faster than the creature they propel, or an arm can reach out and grab faster than a creature's whole body can move.
What does Shade prefer?