It is some work convering.
kw to HP/ L per 100k to mpg/ imperial mpg to us mpg/ Kg to Lbs
but you already know.
Google does a good job of converting units from free-form input; it even inverts where necessary. The only flaw is that it thinks 'gallons' are those funny little American ones unless you say otherwise. Example: 295 miles per 7.4 gallons in liters per 100 km