Fusion Wars tanks can eliminate friction with the surface, this allows them to rotate freely while moving in one direction. To use it you have to hold Brake and Throttle at the same time. You can even control the amount of friction loss allowing you to do really crazy maneuvers.
This improvement is one of the key mechanics of Fusion Wars and gives us the chance to face large groups of enemies dodging shoots, or avoiding attacks which will cause us huge damage. The possibilities are endless if we combine it with the Turbo.