My two bits --- I would go off the treadmill even though we like to use our watches for distance pace etc, when you have the treadmill set at an incline that will throw everything off - have a look at the excel sheet attached it provides a calibration factor when comparing running on an incline to what your actual pace would be if running outside on the flat (it takes into consideration wind etc) there was a thread here and a like to Cody Beals who wrote a good article on this.

I would agree with Gskalt - the best metric to use would be heart rate when on a treadmill, but then you have an increase in body temp which increases heart rate oh the issues we face :)

Train safe.....

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"PAIN is nothing compared to what it feels like to QUIT"