Why shouldn't they just extrapolate? 1 l / (fuel-used-for-16-kilometers-Shell-competition-in-liters / 16 km) * 0.621371 mi/km
> And why describe fuel economy in miles per liter?
err, why not?
The most common fuel efficiency ratios are expressed either in miles per gallon or kilometers per liter (or liters per 100 km). Mixing imperial and metric units is pretty unusual.
This is a bit of clue that the article is written by a non-technical writer, or the editor is also sloppy.
In the UK road distances are almost entirely expressed in Miles, including all road signage. Fuel is sold by the liter.
what's the difference between a car that does 20 mpg and 40 mpg? what's the difference between a car that does 40 mpg and 60 mpg?