Tested my max HR today, but may have to do it again as it was wet. Warmed up for a mile to the track, then did quarters. First lap got to 174, second got to 180. Problem is the track was so wet I felt like I would slip and only ran a 1:21 and 1:22. Decided I'd get better grip on the roads and did a few more quarters, seemed to work better although these were barely sub 1:30s. Max was 197bpm (with a decent incline). This is a bit faster than the various sites would indicate.
So, if I'm calculating right,
138 Recovery = <70% mHR
148 Long Run = <75% mHR
158 General Aerobic = <80% mHR
169 Marathon Pace = <86% mHR
179 Lactate Threshold = <91% mHR
180 VO2max = >91% mHR
Which would mean that my weekend run with 140 bpm was closer to recovery than a proper LR pace. Seems about right.
ETA: The LR pace is actually exactly what the formula from Mark Allen gives if I give myself credit for working out 7 or more times per week, which I probably should. It also matches Maffetone's forumala:
http://philmaffetone.com/180-formula