Hi All - Glad you still seem happy about your running.
The treadmill is easier because the "ground" is always moving away from beneath your feet. To counteract this you should put the incline up to 1 (or whatever - I mean the first degree of slope!). Outside, the ground is more uneven, too, so you have to try harder, but you get people's gardens, sunshine, trees, flowers, etc. Guess where I prefer to run!
Good luck everyone.