Doing the math:
1.82 x 273 yards = 496 yards for the 3 caps, or an average of 165 yards per cap. The caps came out all about the same size.
What is interesting is that the Lion Brand chart of approximate yardage indicates that an adult cap should take 230 - 360 yards of sport/DK or worsted weight yarn to crochet an adult hat, or 225-275 yards to knit. Way more yarn. Hmm.
Nancy's Knit Knacks yarn yardage card suggests that a woman's knit hat would take 175 yards in sport or DK weight yarn, which is closer to what I got.
Clearly, Lion Brand wanted to err on the side of safety.
On to the next project!