Dark Roasted Blend: 'The internal combustion engine put an end to the reign of the steam tractors. This is a Rumely Oilpull, which ran on kerosene. Kerosene was cheaper and more plentiful than gasoline in those days. The tractor was called the "Oilpull" because oil was used in the cooling system instead of water. The "smokestack" on the front is actually part of the cooling system.'