CPC Eco-Driving & Fuel Efficiency 2 — Questions and Answers
Question 1: What is AdBlue (DEF) and why is it important for modern diesel HGVs?
- A fuel additive that increases power output
- A urea solution injected into the exhaust to reduce NOx emissions to comply with Euro emissions standards (Correct answer)
- A coolant supplement for long journeys
- A lubricant for automatic gearboxes
Correct answer: A urea solution injected into the exhaust to reduce NOx emissions to comply with Euro emissions standards
AdBlue is used in Selective Catalytic Reduction (SCR) systems to convert harmful nitrogen oxides (NOx) in exhaust gases into harmless nitrogen and water, enabling compliance with Euro 5/6 standards.
Question 2: Which gear-changing practice promotes fuel efficiency?
- Changing up at maximum engine revs
- Changing up as early as possible (block shifting where appropriate) to keep engine revs low in the fuel-efficient range (Correct answer)
- Staying in one gear as long as possible
- Changing down frequently to maintain speed on hills
Correct answer: Changing up as early as possible (block shifting where appropriate) to keep engine revs low in the fuel-efficient range
Changing up early and block shifting keeps the engine in its fuel-efficient low-rev range; high revs in a lower gear burn significantly more fuel for the same vehicle speed.
Question 3: How does route planning contribute to eco-driving for HGV operators?
- It has no effect on fuel — the distance is fixed
- Selecting routes that minimise stop-start traffic, steep gradients and distance reduces fuel consumption and emissions (Correct answer)
- The shortest distance always uses least fuel regardless of road type
- Route planning only affects delivery timing, not fuel
Correct answer: Selecting routes that minimise stop-start traffic, steep gradients and distance reduces fuel consumption and emissions
Routes with fewer traffic lights, less congestion, fewer steep hills and lower total distance all reduce fuel consumption; dynamic route planning using real-time traffic data maximises efficiency.
Question 4: What is the environmental benefit of reducing HGV fuel consumption through eco-driving?
- Only commercial cost saving — no environmental benefit
- Reduced COâ‚‚, NOx and particulate emissions contributing to lower air pollution and greenhouse gas output (Correct answer)
- Faster journey times reducing exposure time for the driver
- Compliance with weight limits only
Correct answer: Reduced COâ‚‚, NOx and particulate emissions contributing to lower air pollution and greenhouse gas output
Each litre of diesel not burned avoids approximately 2.68 kg of COâ‚‚; eco-driving also reduces NOx and particulate emissions that cause local air quality problems and health impacts.
Question 5: Predictive cruise control systems available on modern HGVs improve fuel economy by:
- Overriding speed limiters on downhill sections
- Using GPS topography data to adjust speed slightly before hills to optimise engine load and use gravity on descents (Correct answer)
- Disabling the retarder to increase speed
- Reducing speed randomly to confuse other road users
Correct answer: Using GPS topography data to adjust speed slightly before hills to optimise engine load and use gravity on descents
Predictive cruise control uses GPS and gradient data to accelerate slightly before a rise (using momentum) and reduce speed before a descent (using gravity), reducing engine work and fuel consumption.
Question 6: What is a 'fuel card telematics' system used by HGV operators for?
- Monitoring driver hours via tachograph data only
- Tracking fuel usage per vehicle and driver to identify inefficient vehicles, driving styles and fuel fraud (Correct answer)
- Providing the driver with traffic updates
- Automatically paying road tolls
Correct answer: Tracking fuel usage per vehicle and driver to identify inefficient vehicles, driving styles and fuel fraud
Fuel card telematics correlates fuel purchases with vehicle telemetry data, enabling operators to identify which vehicles or drivers have higher fuel consumption, spot fraud and implement targeted eco-driving training.
CPC Eco-Driving & Fuel Efficiency 2
What is AdBlue (DEF) and why is it important for modern diesel HGVs?