So I'm trying to fit my Asp for exploring, trying to get as close as possible to 37ly jump range.
According to ED shipyard, I should be at 36.94 with this set up. http://www.edshipyard.com/#/L=60g,0Wg0Wg,2-4s6u7_6u5K8S8I,52M0O47Q405U05U2UI2jw
And yet...

Am I missing something? There is a clear difference in mass, but I can't find the discrepancy.
According to ED shipyard, I should be at 36.94 with this set up. http://www.edshipyard.com/#/L=60g,0Wg0Wg,2-4s6u7_6u5K8S8I,52M0O47Q405U05U2UI2jw
And yet...

Am I missing something? There is a clear difference in mass, but I can't find the discrepancy.