Default nexus 7 battery drain irrelevant to clock speed

on the nexus 7 a lot of apps mostly games use a lot more power than they need so limiting the clockspeed should fix that but using francos per app modes or just changing the max frequency but the battery still drains at the same speed
for example:running a game without limiting clock i get 3 minutes per percent but when limiting to 384 which should give nearly double that it still drains at 3 minutes/percent

does anybody else have this problem