Fredericksburg, VA —Quarles Petroleum, Inc., a major Mid-Atlantic fleet
fuel station operator, has contracted with Clean Energy Fuels Corp. (Nasdaq: CLNE) to add
natural gas fuel services at selected Quarles station locations.

Quarles operates approximately 125 fueling stations that are available 24/7 to serve its
commercial vehicle fleet customers in strategic urban areas of Virginia, Maryland,
Delaware, Pennsylvania, West Virginia, and North Carolina. Quarles’ customers have
exclusive access to the stations, using company-issued charge cards for fuel purchases.
Initially, Clean Energy expects to add natural gas fueling capability at several existing
Quarles stations in the Richmond, Virginia and the Washington Dulles International Airport

Ben Wafle, President, Quarles Petroleum, said, “Many of our customers are
interested in natural gas-powered vehicles for their fleets. In response, we have
partnered with Clean Energy, the nation’s leading supplier of natural gas fuel for
transportation, to meet our customer needs for natural gas fuel.”

Greg Roche, Vice President, National Accounts & Infrastructure, Clean Energy, said, “We
welcome the opportunity to partner with Quarles and congratulate it on the decision to
provide this added service to customers. With the expanding availability of light, medium
and heavy-duty natural gas vehicles, fleet operators across the nation are transitioning to
natural gas power. Among their goals are reducing costs, adding fuel diversity to their
fleets, curtailing harmful emissions, and helping reduce America’s dependence on
imported oil.”

Currently priced up to $1.50 or more per gallon lower than diesel or gasoline (depending
upon local markets), the use of natural gas fuel reduces costs significantly for vehicle and
fleet owners, reduces greenhouse gas emissions up to 30% in light-duty vehicles and 23% in
medium to heavy-duty vehicles. Additionally, natural gas is a secure North American
energy source with 98% of the natural gas consumed produced in the United States and

About Quarles Petroleum, Inc.

Established in 1940 as a one-truck oil company in Warrenton, Virginia, Quarles Petroleum is a regional provider of residential propane and oil, commercial delivered fuels, fleet card sites and services, and lubricants. The family-owned firm headquartered in Fredericksburg serves customers in Virginia, Maryland, Delaware, West Virginia, Pennsylvania and North Carolina. Quarles strives to provide superior customer service and competitive prices every day. Quarles continues to seek the right opportunities to accelerate their growth through strategic acquisitions. For more information about Quarles Petroleum, please visit