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RE: l/100KM vs MPG

The difficulty in the conversion is MPG is distance per volume and 
L/100KM is the inverse volume per distance.  You have to do an inverse or 
a 1 divided by (blank) to get the answer.  My physics teachers alway told 
me to lay out and cancel the units:

If your OBC shows 21.3L/100KM then * 1.61 KM/1 mile * .26 gallons/1 liter 
gives 8.91618 gallons/100 miles or .0891618 gallons per mile.  Your more 
interested in miles per gallon, so inverse or flip the fraction to 
1/.0891618 = 11.21 miles/gallon thereby confirming your first hypothesis 
of leadfoot.

In shorthand Take OBC * 0.004186 and inverse.

Hope it helps,
Michael Solomon
96 Z3 (black and tan with violet seats which actually looks great)