How Cirrus arrived at a 200-pound weight increase is a complex tale. Of course, the company started by realizing that it had to beef up the spar, and interestingly, Cirrus says this aspect was relatively straightforward. Cirrus engineers added a few layers of composites and did the necessary analysis. The gear had previously been strengthened to handle the higher weight, so that work was already done (which also tells you something about how far in advance Cirrus plans its product upgrades). Had they left it at that, though, the 200-pound strength increase would have been lost to weight added on the spar and elsewhere to support the greater structure (the Catch-22 of every gross-weight-increase project). For the first time, there’s also a zero fuel weight, a figure that’s new to most piston-single drivers but common to jet pilots. The restriction in the G5 is a zero fuel weight of 3,400 pounds, which essentially means 3,400 pounds of nonfuel weight; so you need 200 pounds of fuel at max weight.