The propane as used in your tractor is liquid and contains approximately 91,000 btu/gal as compared to gasoline at 115,000 btu/gal. For equal size tanks the propane tractor will will run about 80% as long as a gasoline tractor before needing refilling. On a 100 degree day the pressure in the propane tank will be approximately 175 psi.
Methane (Natural Gas) is a little different critter since it can not be compressed at ambient temperature to liquefy. Methane must first be cooled to - 117 (minus as in below zero) degrees F after which it becomes liquid at around 668 psi. This part is not so bad however, as it warms up on a 100 degree day the tank pressure will become 5,000 + psi. As a result for vehicle use methane is typically stored in the tank as a compressed gas at approximately 3,000 psi. Since it is not liquid, the range for methane fueled vehicles even with large tanks tends to be much less than for propane or gasoline fueled vehicles.
In answer to your question: Yes methane can be used in a tractor however you will need a fuel tank and fuel system for methane. In addition you will need a high pressure pump. Home fueling stations are sold by www.CNGPUMP.com. They may be able to help you will the conversion also...don't know. The pump costs around $4,000 and is able to fill a tank in 2 - 3 hours depending on size. There are no doubt other outfits selling this equipment however, I spoke with them at a show 2 years ago and could find the literature.
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