I would not complain
I was wondering what my B2910 was consuming. It stands to reason that
the higher the rpm's the more fuel you consume. The only time I go near
2600 rpms is when I have the tiller on. The rest of the time about 2200.
I used to own a B7200 never figured out what the fuel consumption was
but a 5 gallon can of diesel would last forever.
Best I can figure I use also about one gallon per hour on the M7040 mowing with a 15 ft woods mower. Some areas go uphill where i have to go to full throttle to maintain PTO speed. Generally mowe in fourth gear at 2200 rpm at a speed of 4.5 miles per hour
I got .66 gallons per hour last time I checked, but that was a mixture of mowing and FEL work, the best RPM for me when mowing is 2100-2200 rpm a little below the 540 Pto mark (2400), I can see getting 1 gallon per hour with heavy tall grass and brush mowing.
kubota L 3540 hsdc,B 2320 hsdc & lots of other stuff!
My 3030 burns about .5 gals per hour brush cutting @ pto speed, Pulling a 1000 lb. core aerator she burns 1 gal per hour. I have not done the sea trials on our 2782 front snowblower yet, Im sure she will burn 1 -2 gals per hour with the throttle up and the mid pto engaged.
I have a B7800 with about 30 hours of use and I am using about 5 gallons every 8 hours. I use it mainly for mowing so it is set to PTO RPM most of the time.