Can I USB-tether my Android tablet to my Android phone? IIs it possible to USB-tether my wifi-only Galaxy Tab to my Galaxy S? 

I know how to wifi tether but it is a huge battery hog. Is there a mini-USB version of the Galaxy Tab cable?  If so,  can it be used to tether? 

Thanks in advance...
There is a bit tricky method suggested by one of XDA members.
Rooting is required.
Download &amp; install a Terminal Emulator on your Android Tablet.
Run the Emulator &amp; enter the following commands:

dhcpcd usb1

setprop net.dns1 8.8.8.8

The Android Phone from which net connection is to be sourced must be connected via USB Cable &amp; on that phone enable USB Tether. 

Now you can access internet on your Android Tablet using your Android Phone as a USB Modem!