Sustainable fleets report: Propane posts lowest fuel cost

June 8, 2023 By    

Here are some of the findings from the fourth annual State of Sustainable Fleets Market Brief, authored by clean technology consulting firm Gladstein, Neandross & Associates.

  • The federal government and California have adopted rules requiring an 80 percent reduction in nitrogen oxide emissions from diesel engines.
  • More than $32 billion per year, on average, in public incentive funding for clean vehicles and infrastructure will be available for the next four to five years.
  • A total of 13 states and the District of Columbia have passed or are considering some form of California’s zero-emission vehicles (ZEV) sales mandate on manufacturers, and these same states are expected to consider California’s ZEV purchase mandate on fleets.
  • U.S. renewable diesel production doubled from 2021-22 to 800 million gallons, and renewable natural gas replaced nearly all fossil natural gas in California transportation for the second year in a row.
  • In 2022, compressed natural gas averaged $2.73 per diesel-gallon-equivalent, and propane averaged $2.10 per-gasoline-gallon equivalent compared to an average of $5.78 per gallon and $4.79 per gallon for diesel and gasoline, respectively.
  • Orders for medium- and heavy-duty battery-electric vehicles surged 640 percent, with nearly 30,000 medium-duty orders and 2,400 heavy-duty battery-electric school bus orders in 2022.
  • At least half of fleets across 11 different fleet types, including logistics, transit, school, cargo and delivery fleets, have operated a medium- or heavy-duty battery-electric vehicle in the annual survey, and 92 percent of those fleets plan to grow their use.
  • Supply chain disruptions have raised the price of medium- and heavy-duty battery-electric vehicles, and delays for electrical service have caused multi-year delays for some deployments.
  • The public hydrogen station network grew 12 percent, and the first plans to build station networks outside California were announced for the central, mid-Atlantic and southwestern U.S.

To read the full report, visit

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