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field trial at idle. For this report, it is assumed that all collection vehicles are outfitted with <br />automated lifting devices that are designed to be operated with the engine at idle (most common <br />operation). Again, the engine management system was reset to zero. The vehicle was stopped <br />with the engine running at idle with the power -takeoff engaged for 30 minutes. After this time <br />period, the engine data was collected. This idle fuel consumption rate was measured in 0.01 <br />gallons per hour and ultimately converted into ounces of fuel consumed per stop. Table 4-7 <br />shows the results of the field trials. <br />Table 4-7 Field Trial Fuel Consumption Data <br />Total fuel <br />consumed <br />Total <br />Fuel <br />per <br />distance <br />Total fuel <br />Total fuel <br />Number <br />consumed <br />Fuel <br />increment, <br />Distance <br />driven <br />consumed <br />consumed <br />of <br />per <br />consumption <br />driving <br />increment <br />during <br />during <br />during <br />increments <br />driven <br />at idle per <br />and <br />driven <br />trial <br />trial <br />trial <br />driven in <br />increment <br />stop <br />loading <br />(feet) <br />(miles) <br />(gallons) <br />(ounces) <br />trial <br />(ounces) <br />(ounces)' <br />(ounces) <br />100 <br />3.7 <br />1.76 <br />225 <br />195 <br />1.16 <br />0.53 <br />1.69 <br />220 <br />1.8 <br />1.1 <br />141 <br />43 <br />3.27 <br />0.53 <br />3.81 <br />330 <br />1.9 <br />1.0 <br />128 <br />30 <br />4.27 <br />0.53 <br />4.80 <br />500 <br />3.2 <br />1.4 <br />179 <br />34 <br />5.27 <br />0.53 <br />5.80 <br />660 <br />2.5 <br />0.9 <br />115 <br />20 <br />5.76 <br />0.53 <br />6.29 <br />1 Observed average time spent loading at each serviced household was measured at 15 seconds. Trial vehicle was <br />stopped with power takeoff engaged with the engine at idle for 30 minutes. Fuel consumed during these 30 minutes <br />was 0.5 gallons or 64 ounces. A fuel consumption rate of 64 ounces per 30 minutes = 0.53 ounces per 15 seconds. <br />Figure 4-1 Field Trial Fuel Consumption shows the ounces of fuel consumed per stop for the <br />different increments (distances between stops). A vehicle driving 100 feet between stops <br />consumes fuel at a rate of 1.16 ounces per interval (per stop). To account for the fuel consumed <br />while loading, 0.53 ounces of fuel consumed in the fifteen (15) seconds of time for loading was <br />used. Fifteen seconds was the actual average observed time while monitoring the real time <br />collections in the in-depth cities. Therefore the total fuel consumed for each serviced stop at 100 <br />feet is calculated to be 1.69 ounces. <br />108 •Foth Infrastructure & Environment, LLC R - Analysis of Waste Collection Service Arrangements.doc <br />June 2009 <br />