After seeing Chico Alexander's tips for the Pricing Games on TPIR over the past several months, I've decided to come up with some of my own.
Lucky Seven: First, make sure you know what kind of car you're playing for. Second, only say 5 if you're very conservative about any digit. Third, choose a low digit for the fourth digit if the third digit is 5 because the producers frequently fool people when they think the fourth digit is high in such a situation. Fourth, on the fourth and last digits, if most of the numbers up to that point are either high or low, go with such a number on your next pick. Finally, don't be afraid to say a certain number on all four of your picks, because I've seen a few playings where saying one number four times could've resulted in a win.
Any Number: Go with low numbers first, because they are most often in the price of the car.
Cover Up: Use that "Cover Up Stategy", and go with low numbers for your first picks.
More or Less: First, on each turn, consider the prize you're at and the wrong price for it. Also, don't be afraid to go with "More" or "Less" three times in a row if the first two prizes are both in a certain direction. Usually, all four prizes are not in a certain direction.
One Away: Like Cover Up, go with the lower numbers first, because usually you have to take such a route more times than the higher ones in order to come up with the correct price of the car. But, you should never put all five digits in a certain direction.