I think it makes more sense to give figures for consumption rather than distance/energy, as we're usually more interested in how much fuel it will cost us to tr

I think it makes more sense to give figures for consumption rather than distance/energy, as we're usually more interested in how much fuel it will cost us to travel a certain distance. Bit like going into a sweet shop and having all the sweet's price as "100 per dollar" or "35 per dollar" etc.. It also helps to compare costs, as 20mpg is far less efficient to 30pmg than 30mpg is to 40mpg, but the numbers suggest the difference is similar.