Even in NASCAR on superspeedways downshifting to overtake wouldn’t make sense. Even when you sit in the slipstream for the whole lap and are constantly looking for an overtake. Even when you lose barely any speed in the banked turns and can ride the whole track in one gear. Even if you set the fourth and fifth gears very close, but leave some overhead on the fifth from the top speed — still, downshifting wouldn’t make sense because racing drivers upshift only when they reach the redline on the lower gear in the first place. Otherwise they would be losing speed when accelerating through the gears. The very premise from which you’re working, that the lower gear has better acceleration, ensures that the driver wouldn’t upshift at that speed anyway. And after they upshift, they reach a higher speed that’s beyond the redline on the lower gear.
Even in NASCAR on superspeedways downshifting to overtake wouldn’t make sense. Even when you sit in the slipstream for the whole lap and are constantly looking for an overtake. Even when you lose barely any speed in the banked turns and can ride the whole track in one gear. Even if you set the fourth and fifth gears very close, but leave some overhead on the fifth from the top speed — still, downshifting wouldn’t make sense because racing drivers upshift only when they reach the redline on the lower gear in the first place. Otherwise they would be losing speed when accelerating through the gears. The very premise from which you’re working, that the lower gear has better acceleration, ensures that the driver wouldn’t upshift at that speed anyway. And after they upshift, they reach a higher speed that’s beyond the redline on the lower gear.