This weekend at NEGS round 3 I was using between 3100-3300 mah per run in 17.5. Most all of us was seeing high temps and lots of fade until we all nailed down ESC settings on the wide open track but still about .3-4 fade from beginning to end.
I used a Team Epic LiFe pack charged every round and never took more than 53mah out of the pack. But I am using an analog servo so that might be the difference.