Vehicles:
Ultra-Light
Modifide Mac--not-legal test rig

Team: David, Greg, and Otis Kittle

Number of mice actually carried by vehicle: Ultra-Light--162
Modified Mac--22.3 pound lead weight

What I would have done differently:
Made a stiffer vehicle to enable more weight carrying ability
Used a lower gear ratio
Shortened first lever arm on mouse trap engine for greater startup torque

Price Sheet
Bearings--$4.11 ea (4x)
Mouse traps--$0.32 ea (2x)
Axles--$0.55
CD's--$0.00 (8x)
Nuts--$0.12
Washers--$0.08
Aluminum bushings--$0.20
Wood--$1.75
Total--$19.78

What I would change for next years contest:
Make the course fifteen feet
Increase the minimum mice requirment

Ultra-Light

55 pounds of lead and mice

55 pounds across the finish line = 162 mice

Modified Mac