Our flight time to Gary was calculated to be four hours and 34 minutes, and our fuel burn was slated to be 286 gallons. Our average groundspeed was predicted to be 191 knots over the 871 nautical mile distance. Our routing was slightly different in the end, but the headwinds were very close to predicted, and at one point east of Atlanta we were doing 170 knots groundspeed with no hope of making the trip nonstop. We hung in there, though, thinking about Meigs and wondering if we'd ever land again at the venerable field that opened in 1948. Then the winds eased and we started down toward the shores of Lake Michigan, searching for GYY amongst a covey of oil storage tanks on a clear spring day. Once the runways were in sight, we were offered any one of our choice, so I picked 30. We were on exactly four hours and 31 minutes after takeoff, just three minutes faster than predicted. We also took on 285 gallons of fuel, one less than the DUAT program called for. These are margins of error of one percent or less and impressed me mightily.