Service Manual

Fuel Consumption ISB, ISBe and QSB (Common Rail [...]
Page 5-10 Section 5 - Fuel System - Group 05
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In addition to the measurement of the fuel used, the
following factors provide points for running a test similar to
the recognized Type II Society of Automotive Engineers
Fuel Test.
These procedures are helpful in determining differences in
fuel consumption between two vehicles under the same
environmental, road, and test conditions.
Perform the test with the test vehicle and a control
vehicle. The control vehicle compensates for changes in
traffic conditions.
The vehicles must stay close enough together to
experience the same varying traffic and weather
conditions, but not so close as to affect each other's
driving or headwind.
The test course must be 65 to 80 km [40 to 50 mi] long.
The test route and truck weights must not change during
the test.