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"By coasting before braking, followed by higher acceleration rates, I recorded a 10% increase in fuel mileage ...," David Smith writes.
Specifically, for driving at an average of 60 kilometres per hour (37 mph), approximately 33% of the energy goes into exhaust and 29% is used to cool the engine; engine friction takes another 11%. The remaining 21% is split between rolling friction of tires (11%), air drag (5%), and braking (5%). [ 6 ]
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Each day-of-week's MADW is then calculated across months to calculate an Annual Average Day of Week (AADW) (7 per year). Finally, the AADWs are averaged to calculate an AADT. The United States Federal Highway Administration (FHWA) has adopted this method as the preferred method in the FHWA Traffic Monitoring Guide.
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That is, if a headway is reduced from 12 to 10 minutes, the average rider wait time will decrease by 1 minute, the overall trip time by the same one minute, so the ridership increase will be on the order of 1 x 1.5 + 1 or about 2.5%. [17] Also see Ceder for an extensive discussion. [18]