+2 on the batteries.
Use an isolation relay. They're used in motor homes to separate the house and road electrics. One hypermiling technique is to not idle, even at stop lights. You have to be confident on your hot restarts though.
Think of the bed as a horizontal tailfin, like a '59 Chevy. Everything below the bed and behind the tire should look like this:
http://www.speedhunters.com/2013/06/a-brilliant-view-into-aerodynamics-2/
You might want to read the article on background, even though it's ostensibly about Time Attack cars, it really gets into the whys and wherefores.
Quote:
AB: I would say the most misunderstood thing about aero for the general public is that people think there is one perfect shape and we [aerodynamicists] know what it is, so they are always asking you to tell them. The truth is, there is no good solution that isn’t a custom one and even defining what is better is circumstantial. We call the details of the car the packaging and packaging is the name of our game. Arranging things to make the aero work and making the aero work with the way things are arranged. Bigger is not always better and testing is king. I think that the real questions to ask are: why did this work, why didn’t this work like I expected and what is the next thing to try?
Let me explain about that a bit more. Initially aerodynamics seems so intuitive. If you put a flat plate inclined to the wind it makes downforce. So all you need to know is what angle makes the most downforce, the least drag or whatever. So in that sense a diffuser is intuitive. But it gets complicated when you have a suspension part protruding into the air stream, a dirty rolling tire wake, air coming from whatever of a million things in the front of the car or the car in front of you, hot air off the exhaust and a five mph cross wind at two degrees of yaw or half a degree pitch under braking. All this stuff interacts. It’s about how all the parts work together as a system so unless you understand all the parts you can get it all wrong.
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30% of your drag is in the undercarriage, it says here. Also notice the high momentum mud flap. I've never seen that elsewhere.