Is my car over-charging ?

Beautiful day here in CT, and decided to take the Duster out for some spirited driving :burnout: ..

I by-passed the amp gauge and put a volt gauge in, and it's charging over 15 Volts.. I know I have the high output alternator, but this still seems kinda high..

I checked the gauge against my volt meter and it was accurate .. At 1000-1500 idling RPM, it was 15.1 out of the alternator, and just a hair under at the battery.. The battery is in the trunk and not warm when we got back and tested things..

Should I be concerned ??

Thanks,

Kenny