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MEASURING

23rd December 2010
Page 38
Page 38, 23rd December 2010 — MEASURING
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We drove the four test trucks on the German A62 and Al Autobahns between the junctions for Kusel and Salmtai. A total lap of 180km was driven five times with every truck. Four of the test runs were measured, the first one being reserved for the drivers to get acquainted with the trucks and the route.

The drivers changed vehicle after every test run and hooked up another trailer. That way, every tester drove every truck, and by changing trailers, any difference in rolling resistance could be compensated for A co-driver recorded all the relevant figures at every kilometre, and at every 500m during the hill climbs.

This resulted in a lot of data needing to be processed. But such thorough measuring allows readjustment of figures if a truck was held up in traffic or had to slow down on the test run due to other circumstances.

Once all of the trucks and drivers had done their four test runs, the fuel consumption level was compared with the amount of diesel added at the fuel station, so that metering could be validated.

The temperature of the diesel was also checked twice — at the start and at end of the test runs. Why? Fuel expands because the return flow heats it up during a test run, and can distort the amount needed to top up a truck. Also, the use of AdBlue is factored into the fuel consumption results on the basis of the additive costing 50% of the price of diesel.

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