Last night's run was based on speed, rather than heart rate. So my 800x3, 2x1600 were at pace z4 (4:10-3:55/km), rather than 158-168bpm. Turns out that those two are pretty close to each other. I like the speed zone because it takes my heart rate a while to climb up to the required zone in between intervals (my HR drops pretty quickly once I stop exercising).
I can see some drawbacks with pace, especially bringing hills and headwinds into the picture.
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