For the Tiger case, being able to get 10% faster to vet1 or vet 2 can mean the difference between a dead Tiger (blitz) or being able to engage at 10+ increased range.
For the Tiger case I prefer to chose my target wisely. Instead of shooting at T34 I will shoot at shocks so my opponent would bleed more and I get more exp.
Ans so on and so on and so on.