Fuel Consumption on Massey WR9770 ?

I'm seriously considering buying a used 2012 Massey WR9770 (850 hours) with a 16' Twin Max Razorbar (650 hours) for cutting alfalfa and would like to know the following from folks running them on same:

• Fuel consumption  (Is it 0,39 gallons to the acre as claimed?)
• Which Auto Steer System is the best for this model?
• Do I even need a WR9770 or would the WR9760 suffice as we are only cutting alfalfa on flood plains?
• What don't you like about this model?

Lastly, we're not regulated on using DEF over here in South Africa and supply could turn problematic in the long run. Is there any way to bypass this system?

Thanks for your time in replying...

Fuel Consumption on Massey WR9770 ?