Forgive me for sounding.......hmmmmm, well.....  Ah screw it.  
So you upped a Tiger for 100 Perks?  WHY would you do that?  A disco results in only half loss according to the TRAINER PAGE.  Or at least it used to.... But then again B-29 is listed under some of the HTC pages as well when talking about Perks.
WHEN YOU GET DISCOED YOU DO NOT LOSE PERKS!!!!!
I WAS IN A TIGER AND I GOT DISCOED AND GUESS WHAT,I LOST 50 (ALMOST ALL) OF MY PERKS
THIS IS NEEDED
-NEARY
And don't worry new guy, after a few more months you wont know what to do with all your vehicle perks!