It's quite simple actually.
Here's one story:
208th MD was in range of HQ, so was resupplied through it. The division had 8 tons of supplies and 79 tons of ammo on hand, and wanted 89 tons of supplies and 190 tons of ammo. In total 279 tons. Due to reduced efficiency (0.68 due to local vehicles shortage x 0.9 due to failed admin roll) it requested only 173 tons from HQ. Unfortunately because of global vehicle shortage, and perhaps other shortages (like rail capacity shortage), HQ got only 46% of all supplies requested through it, so it gave only 80 tons of supplies to 208th MD. That was divided into 26 tons of supplies (28% of wanted), and 54 tons of ammo (28% of wanted). Luckily correct ammo was sent, and none was wasted (Sov. Ammo at 100%). So the division had 8+26=34 tons of supply on hand after resupply, and consumed half of that (to conserve rest for next week), that was only 34% of normal consumption of 49.
Moving 80 tons of supplies and 39 tons of fuel over 1 MP (minimum value for units in the same hex) through the week required 21 vehicles (this adds up to the number seen as total vehicle need for resupply), which consumed 2 tons of fuel.
Note: numbers are rounded to tons (1 ton = 2000 lbs), so sometimes they may not add up to the same numbers.
