First off, I like the idea (but I'm not sure I'd be so quick to pirouet my scubby in the snow
) - and well done for cactching the noise of the engine revs at the start. You might want to beef that up a bit actually.
A major tip would be to invest in a tripod - and always think about getting a steady shot. If you can't use a tripod (I admit it's not always practical) hold the camcorder as if you're using a tripod, i.e support the arm carrying the camcorder with your other arm. This is an extremely effective method enables solid shots even on the move.
Also don't be afraid to be ruthless with the editing. Any shot that's slighly obscured, take out (hands, objects out of shot etc etc). For example the very first shot inside your car I wouldn't have used. I'd have gone straight to your mates cars pulling up at the garage. Then when you cut to the next scene, I would have cut before the red car's obsured by the pumps, then set the next in point a few seconds later, when the cars a bit closer and there's more movement in the scene.
Be ruthless with continuity too. When you're shooting something that's not planned, it's sometimes best to be economical with the truth and playback the event out of sequence (obviously you have to start with the virgin snow though!)
I think you've chosen the right kind of music, but the subjects crying out for some fast edits - and someone totalling their car LOL