Personally, While Supernatural speed is fast, it isn't as fast as 40-50 mph, at least at my table.  If he's that fast at yours, perhaps a contest of Athletics vs Driver would be called for because jumping out, stopping and then trying to keep pace with a speeding car would be tough.

Supernatural speed reads "You're able to move far faster than the eye can see -- or at least so fast that what's seen is only a blur..."  From what other people are replying, it looks like I need to cut back on what he can do in terms of speed.  Also, due to the reading of the rules, I didn't allow the driver to make a dodge role with his driving skill because I assumed he didn't have time to get out of the way.

I apologize if this question has been asked, I combed through posts using the search function and didn't come up with anything.  Here goes:

I am relatively new to DFRPG but I have a ton of experience in other tabletops (3.5, Pathfinder, WoD, Star Wars, CoC).  I am running a story with some new players, and I have run into an interesting problem that I am not sure how to handle.  There is a character with supernatural speed/strength (has a totem) that has broken a couple combat scenes I have thrown at the PCs.  Story time:

The party has recovered an item that is sought after by a shadow person who is manipulating things behind the scenes.  The PCs have said item in the back of an m35 transport truck.  While driving with the item, the party is ambushed by 3 highly trained mercenaries and a sorcerer for hire.  The baddies drive up on the truck and start opening fire with a hail of bullets from small arms, and a 30 cal machine gun.  The sorcerer is planning on throwing evocations when the truck is disabled due to gunfire.  Enter gamebreaker PC.  The faster than perception PC jumps out of the truck and bulldozes the enemy jeep with a 10 shift hit effectively crushing my entire encounter plan with little effort.  I did make him dodge random gunfire, but it still made little difference.  So my question is, how do you deal with a character like this without constantly throwing in enemies/situations tailored to stack the deck against said character?