First, make sure you're going to able to earn around $7,350,000 credits before you reach $20Million Credits. Next, set yourself up for the rubberband grind in A-Spec, Like the Wind Race, Indy Race using the x2010. You'll complete around 15 races per hour, earn $1,050,00 per hour and at the end of 7 hours (you'll be sleeping while all this is going on) you will have earned $7,350,000 credits and you'll also have earned at least one 1000 ticket if not 2 tickets. At 2.5miles per lap x 5 laps = 12.5 miles per race x 15 races per hour = 187.5 miles per hour x 7 hours = 1,312.5 miles and 105 races completed. Also, make sure you check your UCD when your done because it would have reloaded a full 30 cars every 5 races which means your UCD would have reloaded a total of 21 times in that 7 hour stretch.