In my game the upgrade cost is not what the manual says it should be. The manual says it should be New Cost - Old Cost, + 33% of New Cost. Instead, the game is charging me the complete new cost to upgrade.
Please find below the link to my saved game. In 3 INF there are Riflemen VI, with Battledress and automatic weapons. I want to upgrade them to Riflemen VII, with Battledress and Gauss Rifles.
The cost of the Riflemen VI is 6 metal, 10 IP, and 1 machine
The cost of the Riflemen VII is 6 metal, 11 IP, and 1 machine
The upgrade cost should be 1.98 metal, 3.63 IP, and .33 machine. Rounding the fractions leaves an upgrade cost of only 2 metal, 4 IP, and 0 machines.
Instead the game is charging me 6 metal, 11 IP, and 1 machine for the upgrade.