Fuel Consumption (005-010)
B3.9 and B5.9 Series Engines
Section 5 - Fuel System - Group 05
Drive the truck on a warm-up test run. Drive enough tests
Difference in elapsed time between each test run can
only be plus or minus 0.5 percent. This will be 15
seconds on 80 km [50 mi] at 60 miles per hour.
The fuel usage of the test truck between test drives must
fall within a 2-percent range, e.g., 2.55 vs. 2.60 km/l [6.00
vs. 6.12 mpg].
The same range also applies between drives of the control
NOTE: The differences in traffic and driving practices can
make the test drive fall out of the 2-percent range.
A minimum of three test drives that meet these conditions
make a valid test. A single test drive is unreliable.
Use the same experienced drivers for all of the tests.
NOTE: The vehicle speeds must be representative of a