We've been running a TF44 here in New Zealand for the last five years. We bought it as a second hand import from the UK. I keep being surprised by its capacity. We normally run out of power before we can throw grain out the back. We commonly achieve a spot rate of 30 to 35 tonnnes per hour in wheat. Thats 8km_hr (5 mph) with a 6 metre (20 foot) cutter bar in a 7 tonne_ hectare ( 2.8 tonnes per acre and I'll let you work that out in bushells)crop of wheat. Ours is 220HP non turbo. The turbo 250 HP would comfortably have a spot rate of 35 tonne an hour. Given that the TF46 is 20 per cent wider right through and has 20 per cent more power at 300 HP it will have a spot rate of over 40 tonnes per hour in standing non lodged wheat. One farmer not too far from here is achieving over 40 tonne an hour in wheat in his TF46. He reckoned that even tho his machine is over 10 years old no modern JD, Case axial flow or anything else could get near him. The only thing that can is the Claas lexion 480 now they have arrived in our market.The thing that amazes me is that a TF44 has the same drum, beater and rotary seperator as a NH 8070. In the TF44 they threw away the straw walkers and put in a rotor which takes up far less room, cranked up the power and got a 50 percent increase in capacity compared to the same machine with straw walkers. Makes you wonder why most of the world persists with walkers. We have harvested wheat, barley, peas and grass seeds. We have harvested brown top grass seed ( a grass with very fine light seed) with no problems although we had to install a kit to cut down the air intake into the fan. The only time we have blocked the rear TF rotor was on one occassion when hrvesting sodden grass windrows that had been blown into lumps by strong winds before the rain.