Just in case you haven't been checking, here are the number of weeks that each team has had the best average in a race up through New Hampshire.

SOCAL Sprint Car Assoc - 5 weeks (Best: 3)
Mafia Motorsports - 4 weeks (Best: 10 - twice)
2Fast4U - 3 weeks (Best: 10 - twice)
Randy Cook Racing - 3 weeks (Best: 7)
Intimidator Racing, Inc. - 2 weeks (Best: 10 - twice)
Racing Traditions, Inc. - 1 week (Best: 10 - did not lead that week, led with 12)
North Coast Racing, Inc. - 1 week (Best: 14)
Texas Motorsports - 0 weeks (Best: 14)

http://www.luckydogracing.com/TeamAvg08.htm