Do not understand how Alternator low voltage load increase MPG.

[kozaz]

Ok, so lets go the other way with this.

Would a higher output alternator increase gas milage? Petersons 4Wheeler or Offroad magazine (I can't remember which one) claimed this. But then again, if the truck were powering auxlliary lights and aftermarket stereo I could see where it would help.

I think my current alternator is an 80amp, but a 140amp is available.