Environmental Awareness, Fuel Efficiency and Vehicle Maintenance
Domain 9, Environmental Awareness, Fuel Efficiency and Vehicle Maintenance, tests how driving and maintenance choices affect fuel use, emissions, noise and vehicle life. For a heavy truck, small mechanical faults and poor driving habits become large costs and visible pollution.
Core rules
- Drive smoothly: accelerate progressively, use the highest safe gear, keep engine speed in the efficient band, and anticipate stops. Hard acceleration and late braking waste fuel and increase brake wear.
- Avoid unnecessary idling. Modern diesels do not need long warm-up idling; idle only long enough to build air pressure and move gently. Switch off in safe waiting areas where permitted.
- Maintain correct cold tyre pressure. Under-inflation increases rolling resistance, heat and the risk of a blowout; over-inflation reduces grip and damages the carcass. Check alignment and wheel balance.
- Fix leaks and excessive exhaust smoke promptly. Black smoke under load suggests over-fuelling, a dirty air filter or faulty injectors; blue smoke suggests oil burning; white smoke can indicate incomplete combustion. Keep the air filter, fuel filter and injectors serviced.
- Prevent spills: use drip trays, secure fuel caps and report leaks. Avoid washing fuel or oil into drains. Noise matters too: faulty exhausts and unnecessary horn use affect communities.
Worked example
A truck uses noticeably more diesel and emits black smoke when climbing. The driver checks the air filter, tyre pressures and brake drag. A clogged air filter and a dragging brake are found. Replacing the filter and repairing the brake restores airflow and reduces rolling resistance, cutting fuel use and smoke. The driver also changes from harsh acceleration to progressive gear changes. Maintenance and driving style together solve the problem; adding a fuel additive alone would not.
Traps
- Idling for long periods to “warm the engine” and burning fuel unnecessarily.
- Ignoring a small fuel leak because it drips only slowly.
- Using the wrong tyre pressure for a loaded truck.
- Treating black smoke as normal for an old diesel.