Light and Heavy Duty Fuel Economy

At a glance

Millbrook has well established procedures for determining real-world fuel economy, emissions, and performance changes when using different fuels and lubricants. Chassis dynamometers, powertrain rigs, hub dynamometers and test tracks ideally suited to this kind of testing are located at Millbrook’s facilities in the UK.

Drivetrain and driveline testing facility using a 4WD powertrain rig at Millbrook
Bus emissions test cycle engineers working in the VTEC at Millbrook Proving Ground

Millbrook tests real-world fuel economy on light and heavy duty vehicles. Variable control is key to determining statistically significant differences (or parity) between vehicle test conditions. This is recognised and focused on by Millbrook’s expert engineers when putting together a real-world fuel economy test programme.

Non-road mobile machinery directive emissions and fuel consumption test procedure

Real-World Fuel Economy Tests

Test vehicles are prepared with required instrumentation, condition changes (to a baseline or candidate fuel or lubricant) and test medium (mileage accumulation or instantaneous effect). Three expertly controlled tests are conducted to determine average performance for all measurements. The process is then repeated to move and condition the vehicle to the next test point in the matrix (next fuel or lubricant package), and again repeated until the test matrix is complete. The data reported typically shows changes in measurements throughout the programme of work and applies statistics to evaluate the significance of these changes.

Test Measurements

Typical measurements for differentiation tests include:

  • Real-world fuel economy
  • Engine/tailpipe emissions (PM, PN, CO2, NOx, HC, CO, others upon request)
  • Power and acceleration
  • Effects on fuelling components (injectors, inlet valves)
  • Effects on lubricant (fuel dilution and wear metals)

Measurements are made over a variety of standard and Millbrook’s own test cycles. These are selected based on the test type, vehicle applicability, and target market. Bespoke cycles can be created for more niche markets such as the off-highway sector.