I'm gonna make an educated guess that since the sales for New Years are 50% off that the upgrades will be as well. To be it's a no brainer to get the upgrades for the Venom, Lotus 125 and the MP4.  It's still a good amount of gold especially if you plan to do the two additional upgrades to get the MP4 fully upgraded.  But my goal is 100% completion and I don't think we're getting better than 50% upgrades discount.  I would like to do the same for the Jags and the P1 GTR but I think those will be 25% only and I think they'll still be in the 400+ gold range.