During my initial type rating training at FlightSafety Tucson, Arizona, I rented a Lear 24B for the flight training portion. We were doing touch and goes on Tucson's long runway (11L).
On the second takeoff just after V1, the right engine rolled back to idle (fuel control failure). We took off on the left engine and climbed out at 1,500 fpm and returned for landing. The tower noticed that our climb was not as robust as usual and asked if everything was ok. This was in July when the temps there are in the high 90s.