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fill tank to top
reset millage
drive till red light comes on
fill car up
take note of amount of litres put in
take note of miles covered
enter miles and litres into that link above
my last reading where 43litres and 326 miles
giving 34.47mpg
computer said 33.3
google has the answer
clue is miles per gallon TBH;)
http://www.torquecars.com/tools/uk-mpg-calculator.php
don't need to enter cost, although it's useful.