RE: Why Board Maker lie about actual volume ?
Let's look at the iS101 as an example. *board state 101ltrs +-5%.
101 - 5% +95.95 ltrs. So the ISAF measured spec is within tolerance.
But who really worries that much. When you are in the market for this type of board you know what you're after. For beginners there is so much float that a couple of litres either way is not really an issue.