I have a dual gauge that monitors both AF ratio and injector duty cycle... As I was pushing the car up a long hill one time at 100+ mph, I *swear* I saw the duty cycle hit 100% for a few seconds. Of course, I didn't really have time to study the meter with all of my attention.
These were the original 182cc injectors (not my 295cc beasts) but *not* on a stock Supra - I had full intake and exhaust mods at the time.