A little confused about the scoring system..

It seems that a lot of the time while playing matchmaking in Halo 4, I’ll have a higher kill count in the post game scoreboard than the in game one. I’m a bit confused on why it works this way.

For example, I played a BTS game with a score of 30 kills(I’m the jerk in the Tank) and received the spree for 30 kills in a row. But once I get to the post game it tells me I had 42 kills.

I would have much rather received the spree for 40 kills, ya know? Can anyone elaborate?

You probably destroyed some vehicles, they count as a kill but won’t count towards sprees.