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Hello, I'm Brandon.
It is the voltage regulator in the alternator that is causing the problem.
Once you replaced the alternator you should not have any more issue.
Make sure to check condition of the belt that is driving the alternator.
Please rate me positive for the prompt serivce, THank you.
Yes, it could be just the belt. It is best to look underneath the belt to see if the belt has cracks condition. Also make sure it has a tight tension.
You could check the alternator by using a voltmeter to see if the output is giving you 14.6v steady.
Sorry, it was late last night.
Yes, it is the whole alternator unit including the regulator inside that will have affect on your experience.
I'm assuming you installed a good new battery inside.
About the MPG - is the check engine light ON? because this have nothing to do with the alternator.
I would like to follow up on the issue?