This question doesn't have enough information to be answered. Each and every new tractor has a different rate in which it consumes fuel, referred as Gallons per Hour. In the United States every tractor sold here that is over 25 HP, is tested by the Nebraska Tractor Test in Lincoln, Nebraska.
This would be the best way to get a figure for the amount of fuel that is consumed for a tractor in one hour under a load.
You would also need to know the size and speed in which you are pulling the plow, this will help you to determine the acres per hour that you are plowing the field.
Once you have those two numbers a simple calculation can be made by multiplying the two numbers together to give you and gallons per acre.
Average is about 400 gallons per acre, up to a maximum of about 900 gallons per acre.
There are 27,154 gallons of water in one acre of land that is one inch deep.
12.62 acre-inch contains 342,687.09 US gallons. (1 acre-inch is 27,154.3 gallons)
16,735,000 US gallons is about 51.36 acre-feet.
One acre-foot is about 325,851 US gallons.
75,000 US gallons is 0.2301662 acre feet.
1,000 acre feet is 325,851,428.6 US gallons.
60,000,000 gallons equates to 184.1 acre-feet.
Garden tractors are best kept for smaller lawns,less than 1/4 acre. For 1 acre or more you will need a full size tractor in order too work the land effectivley.
Generally speaking about 300 gallons per acre.
1/16 acre-inch is about 1,697 US gallons.
Six acre-feet of water is about 1,955,109 US gallons.