Return unit is not specified, and is extremely unexpected: it actually wants dollar / liter instead of dollar / gallon.

The unit of usPrice and euPrice isn't given. It can only be sort of guessed by the description.

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Thanks. :-)

I wrote an additional hint in the description and added comments for the corresponding tests.

I changed it. And with a comment so that it is clear, that 0 means 000.

I said Description >>>to me<<< is very unclear. It means that my English ability is not enough to understand your description. For example:

If the price is lower than 5 $...

I don't know what the price means.(net price or initial price)?
So I started to guess...
Because the test case is very few, so guess is not smooth :]

Nice solution! I like this small footprint :-)

Sorry my english is not so good. Which part of the description you don't understand?

Sorry, i've forgot to test x,x4 / x,x6 problem. I've edited the kata so this solution fails.

Nice kata.
I fixed some mistakes in the description and improved the visualization.

Description cryptic at best. It would be nice if you explicetly show :

var usPrice = { diesel: 2.165, gas: 2.137 };
var euPrice = { diesel: 1.049, gas: 1.149 };
var eur2usd = 1.1305;

it's hard to decide what one should do without reading forum

I assumed that you would normally rounded that way.

I have now added a note due to multiple desire with respect to the liter / gallon - problem.

I'm afraid many non us-warriors may still stay stuck with usd/gallon price , and I think, at least, the word "gallon" should appear in description.