AnÂ article published on the Guardian web site on 20 June describes US research on the public perception of vehicle fuel efficiency in relationÂ to the units used.
A reader of Metric Views has written to us as follows :
“I read this story on the guardian website today and thought it may be of interest to you:
To summarise it, it has been proposed the fuel efficiency in the UK and the US is displayed as gallons consumed per so many miles rather than the number of miles that can travelled per gallon (gpm rather than mpg).
The case for this is valid – it shows the potential fuel savings of a more efficient vehicle more clearly. However there is no mention of the fact that this is how metric countries have been measuring fuel efficiency for many years (as litres per 100 km).
If they are going to change the system it would make sense to adopt the international system.
Admittedly there is still the issue that we use miles for everything so the public would understand gallons per miles better, though perhaps litres per 100 miles might be a compromise moving us in the right direction?”
Metric Views wonders what are the chances of the USÂ changing the habits of a century. And we are not sure about the suggestion of litres per 100 miles – temporary arrangements have a habit of becoming permanent.
TheÂ web site does not appear to have facilities for comment on this story, but it may be possible to respond toÂ Ian Sample, the Guardian science correspondent.
(AndÂ don’t forgetÂ whichever wayÂ round youÂ put the numbers, there are 4.546 litres to an imperial gallon and only 3.785 litres to a US gallon.)