[ipwuysjd] gas mileage exact conversion

some exact fractions and funny words:

1 US mpg (gas mileage) = 1920/7 inch per cubic inch ~= 274.3/inch^2 (gas inchage)

1 km/liter (gas kilometerage) = 1 mm/mm^3 (gas millimeterage) = 1/mm^2 = 112903/48000 US mpg ~= 2.35 US mpg

liter/100 km (gas hectokilometerage, reciprocal) = 1 decimillimeter^3/decimillimeter (gas decimillimeterage) = 1 decimillimeter^2 = 10^20 barn

are British spellings metreage, kilometreage, millimetreage, hectokilometreage, and decimillimetreage pronounced the same as meterage, etc.?  petrol mileage, petrol kilometreage, petrol hectokilometreage (fuel consumption in square decimillimetres).