Normalized consumption
When it comes to fuel consumption, the symbol often appears «normalized flow». It is determined on the basis of test conditions in accordance with Directive 80/1268/EEC.
Measuring fuel consumption with the driver's trip log
The fuel consumption value is measured under three different driving conditions. In urban traffic, the so-called driving cycle is prescribed, which consists of 25 separate processes - among them: idling, accelerating, changing gears, braking and various speeds of 10, 15,32,35 and 50 km / h. Then another trip is added at a constant speed of 90 km/h and another one at 120 km/h.
For the current monitoring of fuel consumption, a properly completed driver's log book is best suited (can be obtained free of charge at a petrol station). Then the flow measurement is carried out as follows:
- Write down the entire amount of fuel filled, every few thousand kilometers - an additionally accurate mileage after a full tank filling.
- Divide the total cost by the kilometers travelled (at least 1000 km) and multiply by 100 - this will give the fuel consumption per 100 km.
- Add data for all fuel added between mileage records.
Fuel consumption in theory and practice
What is the normalized consumption of your Vectra, you will see in the instruction manual. However, these data should in no case coincide with the actual fuel consumption values obtained. While the normalized flow rate is a comparative value, the flow rate you get is the sum of various factors. For example, your personal driving style plays as big a role in this as road conditions or engine condition.
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