Most efficient way to save battery life on Nexus 7 in between charging cycles?

I want to conserve the maximum amount of battery life between charging cycles and specifically when I'm not using the tablet. What's the best way to do this?

1. So essentially I want to do the following before putting the tablet down (not actually turning it off, but putting it into a deep sleep mode that some ROM's allow you to when the power to the tablet is disconnected - this is for a car install and the car is turned off) - turn off Wifi, BT, GPS, Gmail sync is off, and anything else that "wakes" tablet to do something. Also looking for information on what else to turn off to save more battery life.


2. As soon as I turn power back on, I want all the above to come back "on".

I've done some reading and it appears that tasker is good for the second part (although I have no idea how to use Tasker, so that would be a steep learning curve, unless someone can point me to a pre-built script that does this that I can simply copy).

Thanks in advance.