I've got a little question here. Basically we've got this guy named "B" driving a straight track with a high constant velocity u. His buddy, "C" on the side of the track measures B's fuel consumption to be dn/dt. Now C filled the tank with just enough gas to make it the distance of the track. What rate does "B" measure for fuel consumption? So what happens to B's car in the end. Does he make it, come up short or what? -Well here is my crack at it. I'm not exactly sure how dn/dt will look in B's frame. Maybe altered by the gamma factor. One thing for sure is that if B is hauling then obviously relativity takes over. C would see B travel gamma times further. So would C think he ran out of fuel? But in B's frame, the proper time interval.... ugh... I dunno. I suppose thats why I'm asking. Thanks in advance!