Steve, from memory now, my model 3 with a 912 would burn right at3.8 gals. at 5500 rpm.
5000 would show 3.2 gph
4000 2.5 gph
3500 1.8 gph
I never ran the 912 continuously between 4500 and 4800 rpm. so can't give you a gph for that range. The 912 is extremely kind to your pocket book as far as gallons burned per hour. My 912S will easily burn 5.5 to 5.8 gals per hour at a setting of 5500 rpm. Full throttle and 7 gph will be relieved from my tanks.
By the way my old model 3 is still going strong at 1850 hours and at last annual the new owner called me a said his A & P showed 80/80 on all 4 cylinders.
Great engines. Best of luck with yours

Steve Kellander
Desert Fox Squadron
Phoenix, AZ
Model 4 nose gear, widebody
Rotax 912 S Ivo prop
625 hours and counting