Abstract
This research by the Nebraska Department of Roads evaluated the use of liquefied petroleum gas (LPG) and compressed natural gas (NG) by 25 LPG-bifuel and 14 NG-bifuel vehicles operated by 33 transit systems throughout Nebraska. A set of performance measures such as average fuel efficiency in kilometers per liter, average fuel cost per kilometer, average oil consumption, and average operation and maintenance cost for alternatively fueled vehicles were calculated and compared with similar performance measures of gasoline powered vehicles. The study results showed that the average fuel efficiency of gasoline is greater than those of LPG and NG, and the average fuel costs for LPG and NG are smaller than those for gasoline for most of the vehicles studied.
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