Casper
CI zero does not give a speed close to green dot speed (that would be best endurance). It gives max range speed, which happens to be quite faster than green dot.
Pilot's wings
If you want to stay in the air as long as possible (patroling, holding, search and rescue...) then fly max endurance. If you wanto to cover as many miles as possible then fly maximum range.
Max range speed is faster than max endurance speed.