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Daox, my testing from years past has shown that the ignition system (modules, pickups, and sometimes coils) is the major draw when the key is forward but the engine is off.
Some newer vehicles will also energize other things like CCP solenoid, MAF circuit & burn-off cycle, AIR diverter solenoid, AIR (electric) pump, O2 sensor heaters, and IAC stepper motor cycle just to name a few.
From what I have seen, the O2 heaters and ignition system are the largest drawers with key on/engine off. Yours may be different, but it's worth checking into.
C3H8, There are a couple of products out there used by racers to provide a stable regulated voltage to accessories like the fuel pump. I have used the Jacobs Accuvolt, and friends of mine have used KB boost-a-pump.
The Accuvolt works great, but it isn't very efficient. It steps up the voltage, then regulates it down to whatever you set it at. It has its own internal losses. Good for racing, but probably not so good for FE unless making up the extra electrical power isn't costing you more fuel.
I can't tell you exactly how the KB unit works. You might be able to supply a constant 12.0 volts to your fuel pump (alternator on or off) without incurring much electrical loss through the unit itself. Obviously supplying a voltage higher than battery voltage while the alternator is off would require more input power.
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