From a local air quality perspective , EV buses are the preferred alternative . In Table 3 , our analysis shows reductions across the board for on-site emissions when a diesel bus and an electric bus are compared along the same route . The analysis used nearly 55,000 miles per year to calculate the emissions impacts as this is the average distance a diesel bus in our Dulles International fleet traveled in 2019 . More than 11,000 gallons of diesel fuel were used to complete these 55,000 miles .
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