As the proud owner of a Volkswagen Lupo 3L, with its legendary mileage of 3 liters of diesel to 100 kilometers I'm trying to find out it the manufacturers claims are true or simply to good to.

So, here is a list of kilometers and the amount of liters I've tanked. The kilometers are rounded down to the nearest kilometer, and the amount of liters upwards to the nearest tenth of a liter, with only the last 25 data points taken into account.

Data points

liters		kilometers		kilometer/liter
17.8		433		24.3
13.5		327		24.2
16.6		413		24.8
14.9		370		24.8
8.3		216		26.0
15.7		401		25.5
6.9		220		31.8
12.3		338		27.4
14.6		375		25.6
13.0		356		27.3
15.9		443		27.8
14.3		397		27.7
9.6		229		23.8
8.5		231		27.1
9.8		262		26.7
20.4		584		28.6
15.7		410		26.1
12.5		347		27.7
16.3		412		25.2
20.5		577		28.1
20.0		583		29.1
18.6		510		27.4
24.1		669		27.7
21.1		585		27.7
23.5		628		26.7

Average value (last 25 data points)

liters (total)		kilometers (total)		kilometer/liter (average)
384.4		10316		26.8

Average value (full history, 35 data points)

liters (total)		kilometers (total)		kilometer/liter (average)
555.4		14566		26.2