Ok I may be on to something. I got the latest version of the O2 Micro driver installed that keeps its identity in the device manager. That is version 3.0.8.34 A03 (Dell driver #4Y1R8). This driver installs in place of the "SDA Standard Compliant SD Host Controller" that is under "Intel(R) 8 Series PCI Express Root Port #4 - 9C16". The controller now appears in the "Storage controllers" category as "BayHubTech/O2Micro Integrated MMC/SD controller", and my SD card shows as a "SD SCSI Disk Device" under that. The Audio driver performance may or may not be related, so I will include the fact that I unpakaged the latest Realtek HD Audio driver 6.0.17399 A03 (47P33) manually using 7-zip as that was the only way it would unpack the actual driver files and install correctly. So I have the above mentioned SD card driver installed as well as the latest Audio drivers installed. The new audio drivers run fewer processes and one less startup item, so that definitely can't hurt things. I stopped the O2FLASH service and set its startup type to Manual (Disabled is probably fine also). I am not sure this makes a difference, but I do see that it doesn't appear to affect the operation of the SD card slot at all. An initial test shows that the HW low power state percent is now in the 98% range for the first time ever in my sleep study history! All the others are basically zero. I just ran it for about 20 minutes in connected standby, but this is a great result! I am going to leave it running for a longer time in standby and let you know how it goes. If you can or cannot duplicate these results please let me know; there may be other factors in how I have configured the computer that could play into it. However the changes I mentioned are the ones I made between the standby sessions with 0% HW low power state and now 98%. I am cautiously optimistic! :-)
I had been posting in a different thread about display freezing, but I figure that this is a different issue even though it may appear to the display that is draining the battery.   So, here is my problem.  Whenever I allow my Venue 11 Pro i5/128 GB/64-bit/Office 2013 go to sleep (power button, timeout, or close the lid on my mobile keyboard), it appears that the system goes to sleep - display turns black.  However, when I open it back up, I end up seeing that 3-6% battery per hour is depleted. That seems way too much.  If I power it off instead, almost 0% is depleted by the next time. I started with the .3316 display driver and I have attempted to upgrade to .3345, but it doesn't seem to help.  I also have checked the BIOS - "A05".  I am more than willing to run whatever test is necessary to diagnosis, just not sure what to try.  Below is a "powercfg /sleepstudy" of the most recent sleep cycle.  As you can see, the Intel Graphics Family Device is 100% active during a connected sleep cycle.  Also, I have noted that occasionally, the fan will turn on while it is asleep - I know this thing can't be that power hungry.  Can anybody help?  [IMAGE] 
Dell Venue 11 Pro Battery Drain Issue