Propane has a narrow range of flammability when compared with other petroleum products. In order to ignite, the propane/air mix must contain from 2.2 to 9.6 percent propane vapor. If the mixture contains less than 2.2 percent gas, it is too lean to burn. If it contains more than 9.6 percent, it is too rich to burn.

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PERC and DOE Clean Cities Grant Partnership Program
2005-10-27

The Propane Education & Research Council (PERC) and the Department of Energy Clean Cities (DOECC) have developed a program that provides funds for propane engine development projects. PERC and DOECC have each contributed $100,000 to the program. This partnership has created an opportunity for the propane industry and Clean Cities to develop deployment programs to stimulate market growth. Please click here for more information.