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Step 17: Develop and Monitor Energy Performance Indicators (EPIs)

Mileage reductions year on year

A simple measure of total mileage can be simple to capture and easily understood at presentations. However in a fast growing company, you will want to increase your business and

Fuel usage improvements year on year

Use your total fleet fuel usage figure as a baseline for improvement year on year in your fleet usage: for example improving from 38l/100Km to 37l/100Km. Using conversion factors to derive CO2 output by multiplying the total litres used by a constant;

  • 2.63Kg of CO2 per Litre of diesel
  • 2.30Kg of CO2 per litre of petrol

If only total monetary values are easily obtainable historically, use AA historic prices for period to derive approximate volume usages.

Energy Efficiency improvements year on year

Companies that achieve high km-per-litre figures do not necessarily have the most energy efficient distribution operations. High fuel efficiency can be offset by poor utilisation of vehicle capacity. Energy efficiency is best measured by a composite index which expresses fuel consumption on a tonne / cage / pallet-km rather than vehicle-km basis.

Monitor fleet vehicle choices for fuel usage and emissions

When you compile your fleet profile, you should be able to rate each vehicle by its CO2 output in g/Km as published by manufacturer or derived from its fuel usage.  The resulting total g/Km average figures can be used as target for reduction when new vehicles are purchased:

Your commercial vehicle fleet fuel usage will vary widely with vehicle type, configuration and day to day operations, so look to fuel usage and Energy Efficiency measures:  when purchasing new vehicles, road-test and measure fuel usage brim to brim whilst monitoring loading.

Car fleets are somewhat easier to rate as all cars carry people, combined fuel usage and CO2 emissions must be published by law. The modern Irish car fleet now rate as follows:

  • Specific fuel consumption for new petrol cars on the road in Ireland in 2005 was 7.2 litres/100km (40 miles per gallon, mpg).
  • Comparable 2005 fuel efficiency figure for new diesel cars was 6.3 litres/100km (45 mpg), which was 2.1% higher than in 2000.

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