It all depends on the tractor. A 90hp tractor raking with an average sized rake will use less fuel than a 60hp tractor pulling a 4 bottom plow, but in terms of hp/hr./gal, the 60hp will be more efficient. I.E- The 60 hp tractor will make approx 16hp per gallon/hr., or use 3.75gal/hour. The 90 hp tractor will be making about 14hp/hr./gal, or use 3.077gal./hour. Because it is only making 40hp, it's using less fuel overall, but making poorer use of the fuel. If the engines are equally effieient at their respective peak rated HP, the one closer to it's peak HP will be working more efficiently. I.E- A 60 hp tractor will use less fuel per hour than a 90 hp tractor doing a job that requires a CONSISTENT 55hp. This is where the problem comes in. Most, if not all, field work doesn't use a consistent HP, so the bigger tractor may very well be more efficient once you factor in your time (and sanity).
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