The units still confuse me, but it does indeed seem that calories and kj's are pretty close with the garmin (at least with a PM). For some reason I thought they were very different, but I think that happens when the garmin calculates calories without a pm.

Count: 12 Activities
Distance: 301.33 mi
Time: 16:58:43 h:m:s
Elevation Gain: 8,786 ft
Avg Speed: 17.7 mph
Avg HR: 151 bpm
Avg Bike Cadence:100 rpm
Calories: 12,722 C
Max HR: 187 bpm
Avg Power: 211 W