Hint: You need to choose a single-car setup for many of the back-to-back stages that normally call for radically different gearing or tire choices. Run both of the back-to-back stages in Time Trial mode beforehand to determine the best compromise settings.
Hint: Establishing a fast stage time is all about rhythm. Learn to anticipate the upcoming bends from your codriver's instructions, then work the throttle and brakes smoothly and firmly in response. When you get it right, you will feel as if you were involved in a high-speed dance with a very responsive partner.