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As some have said, doing this will net worse mpg for you because the alternator is not very efficient at recharging your battery. So on the night time trip home the alternator is going to be working extra hard because the battery was already drained (not fully, but partially) on the way to work.
You might find better results in driving to work with belt on, then taking the belt off at night where the alternator works a lot harder.
I did a test with the alternator on and a full load of electrical (lights, defroster, blower, radio) and then another test with the same loads, but this time with my alternator in low charging mode and i got 13% better mpg on a flat road .5miles and cruising at 40mph.
The same test with no load was like a 1-3% difference.
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