Hey Elchivito

I think you are getting your km/L and L/km mixed up

Clarification:- The first number you quote is a volume divided by a distance and the second number has the units of distance divided by volume.

According to Google an imperial pint is 0.568..... Litres
One mile = 1.6 kilometres

Assuming there has been some rounding of the numbers quoted in your owner's manual the ratios quoted approximately say (when twisted the same way up and converted into metric units) that usage of one litre within 666 kilometers can be expected - However if you do use that much I'd keep a close eye on the oil level as you only have 6.5 Litres or so to play with!

My W123 300D doesn't use any where near that much despite its leaky front crankshaft seal.

As a point of interest (or not) the same figures are quoted in a Dutch manual that I have but I can't find this information in the original German / Swiss manual...