2 degrees up-slope and leisurely walk of 23 min/mile speed.
But I strap wrist weights and exercise my arms at the same time. 40 sec video: https://www.youtube.com/watch?v=I55ZxIwbuOU
The secret is doing this 5-6 days every week. No need for excess speed, because I do not want any injury. Those do not heal quickly at my age 81.
So on my treadmill, speed is in mph - example 2.3 mph. So I’m not sure if you’re saying the same thing.
And elevation is adjustable in .5 increments. This isn’t identified as degrees, so I’m not sure how to compare.
After a heart attack 8 years ago, I set it at 2.3 mph -2.6 mph for 30 minutes and adjust elevation to keep my heart in the target range.
Consistency seems to be the key