The easiest place to farm credits in the game is by doing the Hongkong track of "Stop the Bomber" mode. As seen in the video, it took about 4 seconds to clear the objective, which will reward 2,500 credits as result. One cycle, including the loading time, could be done in around 30 seconds. The most expensive car in the game is Toyota GT-One sold at one million credits. So theoretically, from a brand new game and without playing any other modes, it's possible to buy the car by repeating this track 400 times, which takes around three hours and 20+ minutes. However, the Bomber mode could only be played after clearing all five tracks on Racers mode, so it would add a few more minutes to finish.
0:00 Opening
0:29 Main Menu
2:23 [Stop the Racers] Paris (16.86 sec)
3:25 [Stop the Racers] New York (43.40 sec)
4:55 [Stop the Racers] Rome (26.66 sec)
6:02 [Stop the Racers] Hongkong (18.43 sec)
6:56 [Stop the Racers] London (27.86 sec)
8:08 [Stop the Bomber] Paris (~20 sec)
8:51 [Stop the Bomber] New York (~26 sec)
9:41 [Stop the Bomber] Rome (~19 sec)
10:22 [Stop the Bomber] Hongkong (~4 sec)
10:49 [Stop the Bomber] London (~11 sec)
At present, Zeo has 750 views spread across 7 videos for Test Drive 6, with his channel uploading 2 hours worth of Test Drive 6 videos. This is less than 0.62% of the total video content that Zeo has uploaded to YouTube.