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I've got almost 80k on my 2002 civic si and have been averaging about 470-80km per tank filling up 40 litres. its running stock, never modified. about a month ago i bought a bottle of penzoil fuel injection cleaner when buying oil and my first tank i got up to 530km immediately, next tank i got 560km and then 590km. i can't believe the gains i got with this thing, my tank must have been really dirty or something. i usually shift about 3k on my auto and 100km/h on the freeway, pretty much granny shifting. give it a try, well worth it to me with the current gas prices.

 
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You wanna make sure that you put fuel injector cleaners in close to when you are about to change the oil. The reason for this is because it weakens the oil viscosity. Usually I throw a bottle of STP before every third oil change into my gas tank. Just my....1.7 cents....