Part throttle/low rpm "bogg/surge"

I have recently replaced the voltage regulator and I'm planning on replacing the alternator. I'm just wondering is this in gear stopped drain normal? I mean even with all loads off in order to break even on draw i would have to set the idle in neutral at 1100 rpm....I have had the battery tested (made sure it was fully charged) and it IS a good battery.


1972 dodge demon
318 factory everything except carb and intake.