Most of this energy is consumed (Figure 6) in transporting LPG, mainly in heavy-goods vehicles. Therefore, the primary energy type responsible for the footprint is diesel, which is also consumed, to a lesser extent, in terminals, depots and filling plants.
After diesel comes gasoline, which powers automobiles and vans for deliveries, sales and administration. Then comes electricity, which powers storage filling operations as well as offices. The footprints of LPG, natural gas and heating oil consumption are very minor. Employee air travel and train travel have been classified as ‘energy types’, because direct fuel consumption data for these are not available – in any case, together they account for less than 1% of the corporate footprint.