I've searched for an answer to this for a long time, and I'm hoping I can get some help here. I'm working on a Technic car that uses PF motors to be a mobile vehicle. However, I've found time and time again that the model ends up being just too slow for my liking (if anyone has owned the 4x4 Crawler set, you know what I mean by slow). I own 2 L-Motors, 5 M-Motors, 1 XL-Motor. My question is: How do I make the model have faster speed without it looking like a skeleton car, and also, does adding additional motors increase power? For example, if I gear together 4 M-Motors so that they all end up on one drive axle, is their power combined?