Give me a more realistic figure, then. This is what I used to arrive at my figure.
And I got the base power draw numbers here ->
Ecomodder: MetroMPG -> List of "typical" electrical loads in a modern car
I took out all of the intermittent loading, as well as stuff I don't even have (throttle-by-wire, for instance). Even assuming no blower motor, LEDs at all exterior running lights and all interior lights, and no radio, I still arrive at 35 amps at a bare minimum.
Edit: Hm... maybe replace my blower motor resistor with some sort of PWM motor driver... that's an idea. Ought to cut down on the blower motor consumption.