Template:Convert/L100km

Note how, according to this subtemplate, miles per gallon (whether imperial or US) are proportional to litres per hundred kilometres. This, of course, is not true. The standard subtemplate gives the correct conversion (rounded either two sig figs or to the same number as the input, whichever is greater). Thus it converts 7.8 L/100 km correctly to 36 mpg-imp or 30 mpg-US (this was the number chosen to work with) but fails for any number much greater or less. Similarly the conversions from 0.00521 mpg-imp or 0.004338 mpg-US to L/100 km are about right but choose much different numbers and it doesn't work.

The problem is that there is no inversion being carried out. Convert II (the Oct 2007 - present version) needs the  and the   for these volume (of fuel) per distance to work. says invert but only works with  display subtemplates.

Hence this template will be taken out of service. I'm moving it into the L/100 km sandbox for testing as a subtemplate to function with Convert III (a new version currently under construction).