- Economical - After the government offered 50-cent rebates through the Energy Bill of 2005, some school districts are paying about $1.80 a gallon versus $4.35 for diesel fuel.
- Environmentally friendly - The system on an 8.1-liter engine or on a school bus is the cleanest truck in the world, Donaldson said. It meets all the Environmental Protection Agency requirements. Propane is a very clean-burning fuel.
- Energy independence - Ninety percent of propane is made in the United States, and a good portion of that is made in Texas. Most of the country’s surplus is stored outside Houston.
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