I haven't noticed that it's been bad, but then I've had more to worry about... I have the same CPU (and, I thought the same config...) on my work laptop and no problem with battery drain there; I use 'hybrid-sleep' (suspend to swap & RAM, resume from the latter if possible but tolerate power loss).
It sounds like you might be using 'shallow' or 's2idle' (suspend to idle) sleep mode? You might need to write 'deep' to /sys/power/mem_sleep. (But don't listen to me, mine segfaults!)
It sounds like you might be using 'shallow' or 's2idle' (suspend to idle) sleep mode? You might need to write 'deep' to /sys/power/mem_sleep. (But don't listen to me, mine segfaults!)