Post every tip here. Red bull challenge appear to be the fastest way but it´s way to slow and just a mindless grind particularly for one that is not a fan of super downforce racing. Credits is needed to drive cars in GT 6. There is just a few select cars available as courtesy cars in single player. There is no way to test drive cars you don´t own only in license tests you can try some out. I have wasted millions of CR on awful cars that was broken and just fillers. As soon as you buy or acquire a car it lost 2/3 of it´s value somehow... The AI well everyone who driven GT know how that is and still I don´t know how many times you would have to redo the career and gold all races before you could afford every car. The entire game is designed so you shouldn´t have easy access to what you bought but Polyphony is helpful in letting you pay 60$ there about for 7 million credits. Pay 180$ and you can purchase a Ferrari 250 fair? At this point where I done all goodwood, lunar, redbull seasonal events and got gold on all super I own some 43 cars and have 3 million in the bank. I need money for 1150 more cars thus though perhaps can discount some 50 cars or so in the courtesy menu. There was a glitch prior to 1.02 but I missed it by two days so I could never do that. If you are still on 1.01 you may be able to do it.