Yup..no way..just bizarre inaccurate fuel gauge. I have noticed strange fuel gauge behaviour on the 2010 2.0L MZR as well.
Put it this way, 55L tank and assume 260km and 5.0L/100 km. That's about 13L of fuel used or about 24% of the total tank. So ya, 1 square is totally off.
Greyseason's fuelly page is innaccessible so no way to see the real figures