Just finished 1500 acres spring wheat in NC North Dakota with a 08 8010 with a 40' honeybee header and experienced much the same as yourself. Running in 40-50 bu steele wheat, mph ranges from 5.5 to 2.5 depending on the time of day and humidity conditions. Acres per hour from 13 to 20. With tweaking and a hard thresh kit in the tailings dockage is right at 1%(running presieve at 3, top sieve 18, bottom sieve 7, fan 980, rotor 900, concave at 1). Fuel useage also depends on conditions but I remember seeing it at 2.5 gal/acre. This is all with the chopper knives fully engaged on a standard chopper. Wondering if others fully engage the chopper knives for tough spring wheat?
I have noticed it being more finicky to get crop settings set, but once that sweet spot is acheived my old 1688 wouldn't touch the sample that the 8010 achieves. Looking forward to starting canola as I have been told that it really shines as far as sample quality, capacity and amount left behind. Just my $.02.
Other than the honeybee header not feeding the feederhouse like I think it should(seems to bunch-up and plug the feederhouse in tall heavy fluffy wheat, and replacing a faulty lower sieve actuator everything has been in order and am satisfied. Have only cleaned engine air filter once(didn't even show on monitor), and blew out radiator once(didn't have to either as combine was running cool, just had time to) and replaced cab filter twice(very dirty) in 2000 acres of barley and spring wheat combined.