My farm. 6 gallons in tractor fuel and 2 gallons in truck fuel. If we didn't raise corn, we'd raise wheat which has similar fertility requirements as corn. Maybe a bit more urea on corn, 50 pounds or .11 barrels of oil equivalent.
We have a small North Dakota farm (500 acres) but I work with some larger farms (10,000+ acres). Farm management consulting and software is my full time gig