Bonus is key - 2,000 XP per KEM x 5 for the collider is 10,000, Add an extra 10,000 XP for each 100% bonus if you have the collider active.
The math, divide bonus / 100 then add 1 and multiply that by the basic XP per KEM or Truck.
Also don't keep KEM's. Sell the lot and the next one you build is only $220 or so, with the price increasing until the 25th on is $14,400. If you have a lot of KEMs it'll start at $14,400 each and cost a packet.
You can't add KEMs until around level 11 and can't sell the one that unlocked APU !!
