Green Vehicles for Cool Counties


Hybrid Vehicle Replacement Program

Cool CountiesThe county’s vehicle fleet currently has 104 hybrid vehicles: 55 Toyota Priuses and 49 Ford Escape Hybrids. In 2006, the fuel savings from the use of hybrids amounted to 18,112 gallons of unleaded gas, which equates to a savings of 185 tons of CO2 emissions.

Over the last three years, the fuel savings from the use of hybrids amounted to 37,460 gallons of unleaded gas, which equates to a savings of 363 tons of CO2 emissions.  In 2006, the county converted one of its Priuses to a “plug-in-hybrid-electric” vehicle.  This car:

  • Travels up to 30 miles on electric power from the grid before engine-generated electrical power is used.

  • Achieves fuel efficiency on some trips of over 100 miles per gallon of gas, plus grid electricity at an equivalent cost of about 75 cents per gallon of regular gas as compared to over $3.50 per gallon of regular gas for a similar non-hybrid vehicle.

The county is also pursuing grant funds to complete projects for a plug-in-hybrid-electric school bus and a hybrid delivery truck.  We expect that the school bus would achieve a 40 percent decrease in diesel fuel consumption and the truck a 25 percent decrease with corresponding decreases in greenhouse gas emissions. The county also plans to continue its hybrid vehicle replacement program in 2008 at a reduced pace due to budget constraints.

Diesel Exhaust Retrofits

The county has retrofitted 1012 school buses, 167 Connector buses, and 113 heavy duty trucks with exhaust after-treatments that reduce particulate emissions. The bus retrofits include 436 school buses and 57 Connector buses with treatments that also reduce nitrogen oxides (a precursor to the formation of smog). These retrofits also indirectly benefit greenhouse gas reduction. In addition, FCPS purchased 147 school buses with the reduced emissions engine control.

Idle shutoff and horsepower reduction

All county solid waste trucks and all Fairfax Connector buses have automatic idle shutdown programmed into their engine controls. In addition, the engines on 25 Connector buses have been de-rated by 25 horsepower to reduce fuel consumption and corresponding emissions of regulated pollutants and greenhouse gases by 5 percent for affected buses.


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