Even though he only gained 0.3 seconds over two laps, Qin Miao still felt there were plenty of opportunities in this race.
Moreover, Qin Miao sensed that Hamilton's pace was faster than his. The reason he gained 0.3 seconds over two laps was because Hamilton was being blocked by Verstappen in front, and after catching Verstappen's dirty air, Hamilton's speed couldn't pick up.
So Qin Miao knew that if he wanted to capitalize on any openings left when Hamilton and Verstappen were tangled up with each other, he needed to catch up to Hamilton's DRS zone before Hamilton started his attack on Verstappen.
Thus, starting from lap 22, Qin Miao adjusted his fuel mode to rich mix.
Qin Miao had some experience in fuel-saving techniques, but the amount of fuel he carried was always standard, so after several races, there was often enough fuel left in Qin Miao's car tank to run seven to eight more laps on the track.
