Download RAW file: https://library.csbe-scgab.ca/docs/journal/3/3_1_4_raw.pdf
While engineers have long been interested in propane and butane fuels for internal combustion engines the commercial use of propane only began about 1928. It is only since about 1950 that the use of propane began attracting any widespread attention. At about that time engine manufacturers were announcing engines specifically designed to utilize LPG fuels to best advantage. The in crease in use of these fuels, however, has been erratic and in 1953 only 3% of all tractors in the United States used propane, compared to 7% for diesel, 84% for gasoline and 6% for other fuels. The clean burning qualities of propane make this fuel attractive whenever the price is competitive. The situation in Alberta is similar to that found in the United States. There is at present a surplus of LPG fuel and according to Wright (20) this surplus will continue and very likely increase tremendously in the years to come.
the influence of gasoline & propane fuels on spark ignition engine wear rates during low temperature operation
Stephenson, B.T. 1961. THE INFLUENCE OF GASOLINE & PROPANE FUELS ON SPARK IGNITION ENGINE WEAR RATES DURING LOW TEMPERATURE OPERATION. Canadian Agricultural Engineering 3(1):4-6.