I too am having issues with the battery draining overnight. Last weekend, I did what many on the forum have done in the past and began pulling relays and fuses. My initial current draw with the car off was around 800mA. I pulled the A/C clutch relay first - no change. Then I pulled open the center console and unplugged the HFL - current draw dropped from 800mA to 500mA. I continued searching and pulled the radio circuit fuse - dropped from 500mA to near zero (maybe 20mA at most). As a check I left the radio circuit open and plugged the HFL back in: 300mA draw. I also tried wiating 10-15 minutes for the car to go to sleep but still saw the same thing. Any thoughts on this one? It seems at this point that the HFL and radio are independent...Well, it turns out that it was the HFL causing the problem. The dealer diagnosed it on Saturday. They disconnected it, and now the current draw is down to about 20 mA when the car is sleeping. I guess this is good news, since the HFL is $700 compared to about $1600 for the radio. My dealership is contacting Acura to see if they will participate in the repair, since my MDX is just barely out of warranty.