That method is only valid if you are running to empty between fillups since you don't know how many of the 20L you put in last time you actually used. Fuel sending units are not accurate enough to base it on needle position.
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![](http://www.fuelly.com/smallsig-us/36716.png) ![](http://www.fuelly.com/smallsig-us/36713.png)
Driven: 2010 VW Golf TDI
Driven less: 2001 Audi TT Roadster (225)
Parked: 1982 VW Jetta Diesel
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