Propane and Natural gas are both excellent fuels for engines. Both have higher octane than gasoline and would allow for very high compression and therefore efficient engines. In addition natural gas is the lowest in CO2 emissions of the fossil fuels. Propane has seen periods of popularity in tractors etc. however natural gas has not. The deal breaker for natural gas is that it remains a gas even at very high pressures, propane is easily converted to liquid. For example, at an ambient temperature of 100 degrees natural gas remains a gas 5000 psi, propane is a liquid and 190 psi at this temperature. Even at 5000 psi a tank of natural gas contains much less energy than a similar tank of liquid fuel, limiting the range or run time between fill ups. In addition equipment to handle the high pressures is costly. That's it in a nut shell.
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Today's Featured Article - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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