I'm gonna quote allmighty Cruzz
20 damage, 1000 penetration, will apply debuff "hit light at mine" for 7 seconds
Light vehicle:
1 or 2 debuffs:
engine damage 30%, no crit 70%
3 debuffs
engine damage 40%, threads destroyed 40%, no crit 20%
Heavy vehicle:
1 or 2 debuffs
crew shock 10%, engine damaged 10%, no crit 80%
3 debuffs
threads destroyed 33%, engine damaged 33%, no crit 33%
Problem: debuff stacks to max 5 instead of 3, so making large fields of the mines will actually make the explosions after the first few hugely detrimental because they'll stop crits from happening.
So, you basically should always lay these mines 4 in one place assuming the debuff gets applied after crit calculation, or 3 if before. Someone needs to test that.
You need to put them on sets of 4 (i tested*). It's a matter of time and "micro" (shift command) but the mines on itself are pretty good. For 20muni you get a teller 33% of the time
If debuffs stacks at 5, then putting more than 6 mines per batch is useless.
Do the following. Made a custom game with cheatcommand and put batches of 4 mines, and see how many times it fails to crit a tank. I made the test and failed just 1 after more than 15+ tries**.
*Strategists should change the Infantry guide. Cause putting this mines on sets of 3 doesn't work. It needs to be 4 to get the better debuff/crits.
**Test were try by making batches of 4 mines and then spawning a PIV on top of them.