A possible list of GTA 5 vehicles has been leaked via max pane 3′s files. The ‘vehicles.ide’ file that is present in Max Payne 3 has revealed that there will be 48 Cars, 5 Bikes, 10 Helicopters, 1 Plane, 25 Boats, and 9 Train models.
GTAForums’ member ‘zzcool‘ who found this list in Max Payne 3 files, claims that GTA 5 will have the same or similar list of games. Max Payne 3 ‘Crews’ will be available for play in GTA 5, article can be found here. So keeping that in mind it may be possible that there may be a same list of vehicles in both the games.
Rockstar has included similar lists and lines for various GTA titles in different games (like Bully), so it’s possible that these could actually be the vehicles of GTA V.
Images of all the possible vehicles are below