Originally posted by user440 3FPS while adequate has been a bit lacking in several Rally type races I have attended. This is partially a factor of my inexperience, but also a factor that one does not always have ample time to shoot a quickly moving subject that is moving parallel to your position. 5FPS would provide more wiggle room for these cases.
If your goal is to capture the vehicle at a specific angle and composition, I would really recommend you learn to anticipate for the shot rather than leaving it up to chance with the FPS race. If you get your 5FPS, and the perfect moment happens right at .3s, then you'll still miss. So what will you demand next? 7FPS? 10FPS? where will that end?
I currently use continuous shooting primarily to make film strips where the series of shots are placed next to each other. 3FPS has been more than enough (I even sometimes skip a picture or 2 in my final product because there are too many shots already)