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For the last week I have been doing an economy run with my JDM b18c eg to see how much I can squeeze out of 1 tank and I was surprised.
I managed to get 565km using 41L of petrol. This roughly works out to 7.2L/100km. This is absolutely babying it though, the week before I averaged 8.5L/100km driving it normally. When I had my D16 it averaged 7L/100km
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Judging from the numbers in your B18C2 as well as your Euro, seems like the problem is all to do with your lead foot.
If you drove it carefully you should get ALOT more than 500km's out of your Euro.