mac06
23-10-2009, 04:49 PM
Every now and then we get questions on the fuel consumption figures quoted by manufacturers on the windscreen of all new cars. A lot seem to be complaints regarding the figures being quoted not being replicated in the real world. So I thought I'd give a link as to how these figures are calculated.
Note that all manufacturers have to follow the same criteria and figures can't be fudged as they are audited by the government. The speed on the extra urban only has an average speed of 63km/h. Who travels 63km/h on the open road? Much of the speed is between 50-70km/h with a really small portion between 100-120km/h. To me this is not really extra urban, but at least it's a base to work off. Real world figures will be quite a bit higher. That can be shown by the fact that if you travel at 90km/h as opposed to 110km/h you'll save quite a bit of fuel. Problem is, who wants to travel long distances at 90km/h unless you're a grey nomad.
That means we should look at figures being closer to the urban cycle than extra urban for real world results. That way we don't come in for a "surprise"
http://www.mlit.go.jp/kokusai/MEET/documents/MEETFUM/S4-Australia-sup3.pdf
Note that all manufacturers have to follow the same criteria and figures can't be fudged as they are audited by the government. The speed on the extra urban only has an average speed of 63km/h. Who travels 63km/h on the open road? Much of the speed is between 50-70km/h with a really small portion between 100-120km/h. To me this is not really extra urban, but at least it's a base to work off. Real world figures will be quite a bit higher. That can be shown by the fact that if you travel at 90km/h as opposed to 110km/h you'll save quite a bit of fuel. Problem is, who wants to travel long distances at 90km/h unless you're a grey nomad.
That means we should look at figures being closer to the urban cycle than extra urban for real world results. That way we don't come in for a "surprise"
http://www.mlit.go.jp/kokusai/MEET/documents/MEETFUM/S4-Australia-sup3.pdf