I now have just over 1000 miles on my new Traverse and have noticed one thing which doesn't seem right. My voltmeter which I would expect to read at about 14 all of the time, reads about 13 approximately half the time. It will go above 14 for a minute or so after starting then flip flop between 14 and 13. On a 200 mile trip to Indiana it started at 14 and went to 13 for the last 100 miles or so. Seems to vary intermittently. Is this some new technology to reduce alternator drag for a minute fraction of a fuel economy improvement, or do I need to see my local dealer right away?