JB bluetooth power hungry?

[cerps]

I'm on the stock JB OTA, rooted, and have AT&T bloat frozen. I've noticed that since the update it appears that bluetooth uses a lot more battery when connected. On ICS (10o, rooted, AT&T bloat frozen) I could take my phone off the charger and make my ~20 minute drive to work connected to the car bluetooth (no calls) and not drop below 100%. Since the JB update, I make the same drive in the same car and when I get to work I'm at 97%. If I check my phone 30 minutes later, it'll go up 1% to 98%. I still appear to be loosing 2% during the drive. Is the battery meter just more sensitive now or am is more battery being consumed?