Minecarts move 300 blocks per second

While riding a Minecart, right clicking it EXTREMELY fast will push it along a track. Using a macro to do about 100+ clicks per keystroke will move it 300+ blocks per second.
Doing this with boats will drop the boat out of the world and unload the chunks you are riding the boat in until you left shift out of the boat. Upon exiting the boat, the boat will be lost and the chunks will reload.