Unfortunately, You cannot delete your museum cards. Even if you start sending them away 5 per day to an another account for saving savefile size, nothing is going to change because the data of the recently viewed museum cards have already been written to the savefile. As much as I understand, it keeps them for future use, even if you no longer have the cards. Also, the clear cache option in the GT5 settings does nothing to the size of savefile.
I have been using the museum feature everyday having more than 15 new cards each day (10 more or less from the game + dupes from friends) and I was viewing ALL the museum company/cards everyday to find my dupes and send them away (to my friends). That's the problem... Seeing is believing, oops sorry is growing (the savefile I mean). Now, with an old backup file I use the last past days (around 3800KBs) and I 'm still receiving new museum cards BUT I no longer use the museum feature, so if I don't see the new cards/bitmaps my savefile size will not grow much (about 2KB per game section).
The museum feature I suppose stacks up around 10KBs per VIEWED museum card, plus 1KB more or less per new car with its upgrades/colour and other stuff, and those info plus the horns are saved to the GT5.x files. Money/Races/Levels/rest of changes/etc. I think that are saved either at the end of the latest GT5.x or more logically at the param.pfd file.
My advice to all the GT5 players remains the same: BACKUP your save, STOP using the museum feature (meaning use it to see the cards you have - the images), WATCH the size of your savefile. BE almost sure that the 4165KB is an dead zone for your savefile unless an new title update releases that solves that problem.
I, would also be very careful if I had a savefile around 2048KBs. The same problem many of us have with the creation of GT5.2 file, might appear as an error to those of you that have only GT5.0 file and the game is going to try and create the new GT5.1 file (if you understand what I mean). I believe that the recently released title update from PD (1.05), messed up the formerly well worked system of gamesave by patching it and unlocking it (the company I mean PD). If you already had an GT5.x file then you are safe until that reaches the size of 2048KB and the game needs an new GT5.x+1 file. I stopped playing GT5 with the same passion as the last 2,5 months and I am not going to risk more gamehours on a game with savefile problems, at least before an new update released from PD.
I hope that our voices of desperation and warning to other players reaches out to the ears of PD and fix the problem, before comes as an plaque upon the heads of many thousands of players. OK, that's a bit catastrophic but I suppose playing GT5 every single day for 2,5 months in order to loose all that you have achieved and get an error that prompts you to start all over is a little catastrophe to anyone of us.
I am sorry if my English are not so good, it is not my language.
Plus the fact that my post is damn too long!!!
