Ok so, as has been said numorous times the Garages at each of the safehouses dont work at them moment. I dont know what the deal is but DO NOT SAVE ANY CAR THAT YOU HAVE SPENT MONEY ON AT THE SAFE HOUSE GARAGES!!
The only place atm to safely save any car that you want to keep is in the 4 car storage garage that each character has. Thats the Vinewood garage for Micheal, Grove Street garage for Franklin and the Pilbox garage for Trevor. I have lost well over 2 million dollars worth of cars/mods due to the safe house garages not saving. Including a fully tricked out Adder. Luckily I only lost the value in mods on that one cause it can be found parked down the street from Micheals house.
The way the impound works seems to be, at least for me, any car that you have spent money modifying, that you leave on the street or during a mission will end up at the impound where you can pay like 300 bucks to get it back. This does not include cars lost due to being left in a safehouse garage or random cars you steal and dont put any money into.
Trevors trailer safehouse garage seemed to be the only one actually saving cars I put there but I would not count on that at the moment until Rockstar actually make a statement on the safehouse garage issue.
Nguồn:
http://gtaforums.com/topic/598365-do-not-attempt-to-save-cars-at-the-safe-houses/