Tractors are powered by a variety of engines, including gasoline, diesel, and electric.The largest tractor in the world is the Big Bud 747. It weighs 70,000 pounds and has a 1,000 gallon fuel tank.

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The tractor gets only two miles per gallon, Post said. He’s taken some ribbing from his John Deere friends who say an Allis-Chalmers needs two motors to keep up with a John Deere.