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Re: st-digest V2001 #89



- ----- Original Message -----
From: "Jeff Goss" <jjgoss@xxxxxxxx>


> A long time ago I figured out that a magic number for converting l/100km
> to IMPERIAL mpg.  The number is 284, and you divide whatever figure you
> have into to get the other since they are inverse measurements

Around here not too many people even think about km/100 litres (unless
you're looking at the sticker on a new automobile that is).  I was
interested in such a magic number for deriving MPG directly.  I think that
if you tighten up on the specifications you will see that the number
actually works out to 282.4.

What I do is simply divide the number of km I have ridden by the number of
litres it took to fill the tank and multiply the result by 2.824.  This will
compute MPG (Imperial).  If you prefer to deal with US gallons, then the
magic number becomes 2.3523 (or in your terms 235.23)

Your conversion factors are ok for rough comparisons, but when I compute my
mileage I want to know exactly what it is

If you're interested, the math looks like this:

one mile per Imperial gallon = 1.60935 kilometres per 4.544 litres
one mile per Imperial gallon = 0.35417 kilometres per litre
therefore:
one km/l = 1/0.35417 mpg = 2.8235 mpg (Imperial)

one mile per US gallon = 1.60935 kilometres per 3.7856 litres
one mile per US gallon = 0.42512 kilometres per litre
therefore:
one km/l = 1/0.42512 mpg = 2.3523 mpg (US)





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