So i have been back and forthing with Max Chaos for several days and with a lot of help he has allowed me to make a spreadsheet working out all the math behind crew skills XP and the mentor perk, prem tanks and accelerated training all taken into account and shown

Here is the some up that is taken from it

The breakdown of this is that mentor is a great perk, and a must if you plN to play this game long run, and due to the ever increasing XP cost per skill it is still useful further on. It also shows the most effective XP grinding is playing a tier 2 prem tank with mentor, but by number of games it is only the case if you can consistently get a high enough XP in that tank I.E. If you get 200 XP a game in a tier 2, and 1000 in your tier 6 and 1100 in your tier 8, your tier 6 will be a more efficient tank for gaining Crew XP. Tanks like the T-34-88 have a lower tier prem boost, which is how they gain you additional XP. Tier 8 gets a 10% boost with a linear decline by 10% through to tier 2 which gets a 70% boost by the way .

Here is the link to the full spreadsheet should anyone want to see it in full, at the bottom is a little bit showing how many games can be saved by having mentor if you get X average XP.

Hope this helps people and can be used as a reference point in future should people need to discuss crew things

oh, ps. If any errors are spotted please do tell so i can correct them Max is too busy really to go through every darn cell but it does look right and a sample of numbers are so. But i could have made errors in other places

**Edited by JacKTh4RiPPa, 13 January 2016 - 04:41 AM.**