Here's a little list...for MY costs. Can you do it less??

$128.00 = Gas = 2200miles / (30mpg X $1.75)
$ 78.75 = Gas for Racing = 45 gallons X $1.75 (3 tanks for weekend)
$ 60.00 = Food = Thurs PM-Mon (5 days x 2 meals) x $6 (I'm cheap)
$120.00 = Room = 4 days x ~$30 (your portion >> when sharing)
$ 40.00 = Misc Crap = BEER = $40
$426.75 = WHEW!!

DON'T FORGET...
$ 50.00 - 2 Oil changes
$250.00 - New set of azenis
$ 60.00 - oh yea - I gotta get tires mounted
$ 60.00 - total fluids (coolant, brake-superblue, tranny)
$200.00 - BRAKE PADS! (front & rear)
$620


GRAND TOTAL $1046.75

ouch...WORTH EVERY PENNY + The car will be ready for 3 more events with no maintenance except oil changes! (that lowers the "cost per event")

Hope that helps