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I drive a 2001 Freightliner, over 500,000 miles on it. The in-dash digital volt meter reads anywhere from 13.8 to 14.1 volts at any given time. There are not extra lights, etc to drain power.....basically a plain jane truck. Are these numbers about where they should be? Or is trouble brewing.

Thought someone might like to read thru this......it's quite lengthy, but some interesting stuff in here on how to improve MPG http://www.everytime.cummins.com/assets/pdf/MPG_Secrets_Whitepaper.pdf