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Indian River County 1 Impact Fee Update Study <br />Appendix D, Table D-8 documents the calculation of fuel efficiency value based on the following <br />equation, where "VMT" is vehicle miles of travel and "MPG" is fuel efficiency in terms of miles <br />per gallon. <br />Fuel Efficiency= IVMT oadwayType —1 <br />VMT <br />ehicleType <br />MPGvehicleType JRoadwayType <br />The methodology uses non -interstate VMT and average fuel efficiency data for passenger <br />vehicles (i.e., passenger cars and other 2 -axle, 4 -tire vehicles, such as vans, pickups, and <br />SUVs) and Targe trucks (i.e., single -unit, 2 -axle, 6 -tire or more trucks and combination <br />trucks) to calculate the total gallons of fuel used by each of these vehicle types. <br />The combined total VMT for the vehicle types is then divided by the combined total gallons <br />of fuel consumed to calculate, in effect, a "weighted" fuel efficiency value that reflects the <br />existing fleet mix of traffic on non -interstate roadways. The VMT and average fuel <br />efficiency data were obtained from the most recent Federal Highway Administration's <br />Highway Statistics 2011. Based on the calculation completed in Appendix D, Table D-8, the <br />fuel efficiency rate to be used in the updated impact fee equation is 18.19 miles per gallon. <br />Effective Days per Year <br />An effective 365 days per year of operation was assumed for all land uses in the proposed fee. <br />However, this will not be the case for all land uses since some uses operate only on weekdays <br />(e.g., office buildings) and/or only seasonally (e.g., schools). The use of 365 days per year, <br />therefore, provides a conservative estimate, ensuring that gasoline taxes are adequately credited <br />against the fee. <br />Tindale -Oliver & Associates, Inc. Indian River County <br />June 2014 117 Impact Fee Update Study <br />