So here we are at the start of the 21st century and most things have changed to the metric system. Our road distances and speed limits are however still in miles and miles per hour (mph). I imagine that sometime in the near future these too will change to metric in which case speeds will be measured in kilometres per hour (km/h)
Fuel sold at petrol pumps is now sold in litres which leave us with a dilemma. How do we measure fuel consumption? We can't use miles per gallon (mpg) because we buy fuel in litres, nor can we use kilometres per litre (km/l) this wouldn't mean much because our road distances are in miles. The only solution at present is to use a hybrid unit, miles per litre (mi/l).
Another imperial unit still in use international for air and sea travel is the Knot or Nautical Mile per hour.
The controls below will convert the various units to and from metric. Enter a value in one of the boxes click outside the box and the remaining boxes in the row will show the results
Page creator - David Haworth.