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beginning or ending in Louisville, the distance of the shortest - travel- time -path between the <br />origin and destination was calculated and multiplied by the total number of trips between the <br />zone pairing, then fifty percent of the total VMT for each zone pair was allocated to Louisville. <br />Vehicle counts, broken down by vehicle type (motorcycles, passenger cars, passenger trucks, <br />light commercial trucks, intercity buses, transit buses, school buses, refuse trucks, single unit <br />short -haul trucks, single unit long -haul trucks, motor homes, combination short -haul trucks, and <br />combination long -haul trucks) and age were obtained for Boulder County via personal <br />communication with Jim Sidebottom, Colorado Department of Public Health and Environment. <br />From this data, an average age for each vehicle type was calculated. The diesel fraction for each <br />vehicle type (the proportion of each vehicle type running on diesel fuel) was taken from the 2011 <br />EPA MOVES Report8. Fuel efficiency for each vehicle type, for its respective average age, was <br />found in the US Census Bureau's Domestic Motor Fuel Consumption report9. These fuel <br />efficiencies for each fuel type, diesel and gasoline, were used in conjunction with the vehicle <br />fleet make -up data to find average fuel efficiency for gasoline and diesel vehicles, and ultimately <br />combined with VMT to determine fuel use. <br />Fuel use was computed using the following equation: <br />Fuel Use = (VMTD_;iy *342 working days per year* % Fuel Type) / Fuel Efficiency Fuel Type <br />3.5.2 Airline Trips <br />Energy use associated with jet fuel consumption at DIA in 2012 was allocated to Louisville <br />using the DRCOG regional transportation model6. From the model, Louisville's trip ratio to <br />DIA, compared to the rest of the modelled area, was 0.0058 or 0.58 %, meaning that 0.58% of all <br />trips to and from DIA began or ended in Louisville. The number of enplaned passengers and <br />total gallons of jet fuel used at DIA were both obtained to determine an average fuel use per <br />passenger. Both figures are primary data obtained from the City & County of Denver Colorado <br />2013 Disclosure Statement1° and through personal communication with DIA's Fuel Facility <br />Manager Joe Finucane'l respectively. The total number of gallons of jet fuel used was multiplied <br />by the DRCOG DIA trip ratio to obtain the number of gallons burned attributable to Louisville in <br />14 <br />16 <br />