Don't trust your on board fuel measurement system
The LUPO 3L (and also the AUDI A2 3L are amazing vehicles. They're not sold any longer but achieve above average prices on the used car market. I saw 2.2 litres several times on the BC on my drives, too -but- wait till You top off the vehicle at the gas pump. MPG achieved over a full tank of diesel are just more trustworthy than a non calibrated gauge readings over a shorter distance. Sustained values in excess of 100 mpg in traffic are very doubtable... but it's possible to beat the three litre mark as several longtime LUPO drivers prove.
Currently the VW POLO 1.2 (basically the same 1199 cc engine as the LUPO) TDI bluemotion is the most fuel efficient (seats 4 - 5 people) vehicle being sold on the European market. It delivers 3.3 litres per 100 kms on the NEFZ, New European Driving Cycle (US EPA mpg values are more conservative!). On a recent hypermile (maximum distance between regular fuel stops), I did 1808 kms on 54.7 litres (that 77+ mpg or 9% below NEFZ), vertical gain/drop was 27'000 ft, 53% Autobahn (at 55 mph) 37% rural roads, 10% city. Average speed was 40.4 mph.
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