If it helps, I ran a 06 and 07 Puma and always used the center tank. My 07 never had fuel in the rear tanks when I sold it they were still dry. I never felt the fuel moving around in that tank. I also most of the time kept is no less than a 1/4 tank by the end of a trip with no ill effects from fuel moving or starving the engine. I hope that helps. Judd Lasiter