The current draw is very much a function of the load on the servo. I measured the load on my DS 8411 servos at idle (all linkages disconnected) and I think it was around 50 mA. Then I held the output arm stationary and pushed the stick full left. the fully stalled servo drew about 2000 milli-amps as I recall (40 times as much as at idle). Your DS 8611 servo should be similar -- at least in the same ball-park. So how much does it draw in service? Hard to tell from my tests. But I know if I fly my 35% Cap with 8 of these servos, I use up about 25 milli-amp-hours of capacity for each minute I fly. in other words, if I fly 100 minutes, I have used up about 2500 mAh of my on-board packs. This I have measured by cycling the packs after flying. 25 mAh per minute translates to a current draw of 1500 mA (60 minutes times 25). This is a weird unit of measure (milli-Amp-Hours per minute) but it works for me. I know that every minute I fly, I am using up 25 mAh of capacity.

If my plane is using 1500 mA current draw, this implies the average amongst the 8 servos is about 200 mA. (1500 / 8).

In summary, the "idle" servo draws 50 mA, the "in-Use" servo draws 200, and the fully stalled servo draws 2000.

I carry 4200 mAh of capacity (two 2100 packs in parallel)