statistics - a double-edged sword?

we busy people have a limited time to prepare for games. i will play in a tournament in 2 weeks time. i have been reviewing the tournament games i have played in france so far. these number 19 (9 white, 10 black). these are the first moves i have faced from my opponents



i find that these statistics guide me in how to prepare my openings. but am i asking for trouble by not spending much time preparing, for example, for my opponents caro kann defence? do you use this sort of information from your games to help with your time management? care to share your statistics with us?