A low battery can make it seem as though the fuel is evaporating or disappearing. If it's REALLY losing fuel, you've got a leak. Pretty much anything else will set a code. Either a hard code, which causes the CEL to come on or flash (depending on severity) or a soft code, which MIGHT cause the CEL to flash, but usually won't.
A whining noise could be an alternator bearing. Couple that with the voltage light-bad alternator.
The loss/lack of power could be due to a fuel leak, or it could be excessive back pressure due to a plugged catalytic converter. Or or or or.
A number of places will scan it for free. Autozone. O'Reilly's. Advanced. Some repair shops. But you need to make sure they pull both hard AND soft codes.
At a minimum, it sounds like you need an alternator. That can be checked with a voltmeter with the engine running.
Monday, February 6th, 2012 AT 6:27 PM