| To do spritmonitor.de, you will need actual fuel receipts with litre amounts and actual km figures, tank by tank. Joining there is easy. They're what provide the fuel economy ratings in my signature.
The display you show is probably over-estimating fuel savings by 7%, so it's probably really 7.6. 65 km/h average! Wow, you do a lot of driving on the open road. Mine is down around 50-52.
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2008 Mercedes-Benz B 200 
2005 smart fortwo cdi pulse cabriolet, loaded 
1966 Peugeot 404 Coupé Injection
1989 Peugeot 405 DL, 366,000 km
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