Originally Posted by zoltan
OP, what's your max heart rate? Is that what you're using for your training goal heart rates?
Also, maybe you could use min/mile instead of mph. mph really confuses me in running usage and is (I think) less precise than min/mile.
My max HR is 194. I estimated my max HR using the formula Max HR = 220 - (your age).
I'm usually running at 82.5%-85% (160-165bpm) of my Max HR for the majority of my runs. Running at 80%-82.5% (155-160bpm) Max HR on my long runs.
6.5mph = 9 min 14 sec / mile
7.0mph = 8 min 34 sec / mile
7.5mph = 8 min / mile
8.0mph = 7 min 30 sec / mile
8.733mph = 6 min 52 sec / mile (3hr marathon pace)