So far in 2005, the scarlet team has amassed 39 days of testing, despite the other teams' whole-season limit of 30 days in total.
"I believe Ferrari should adhere to the test limit. If we want to save money, the logical place to start is there," Dr Theissen commented.
In contrast to Ferrari's 39 days, BMW partner Williams has done just 15 so far in 2005.
Theissen rejected the Maranello argument that, because it is the only top team on Bridgestones, Ferrari should be allowed to do more testing than Michelin clad rivals.
"But on the other side," the German said, "Ferrari is interlaced with their tyre supplier like no other team." -GMM