4-7 miles will kill a diesel's battery, it isn't enought time to recover from starting. Maybe consider another minuit of warm up time. And 13.8 volts seems a touch low, almost 14.5 volts is more normal. I think newer cars seem to have the regulator set a little higher than they used to be. Just for grins cause it's not too expensive you could replace your regulator. Being electrically endowed I think I noticed regulators being temperature sensitive, on purpose, the voltage is a little higher when cold and drops as it warms up.
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