I did a quick and dirty figure 8 and exported the parts list. Instead of using individual 10 inch sections, I opted for the larger 30 inch sections. This would make a very large figure 8.
# Element Description
4 of 6-12025 Straight Track (4 1/2")
8 of 6-12042 30" Straight Track
1 of 6-12051 45 Degree Crossover (10")
4 of 6-12056 Curved Track 060 (22.5° Section) in addition to the 16 pieces you have.
8 of 6-12073 Straight track (1 3/8")