I have a 2011 chevy silverado 3500hd, crew cab, 8' bed. Today with 11,500 miles I had 2/3 tanks of diesel and I topped it off at a Flying J gas station. Within 50 miles I got the "Water in Gas" warni...
I personally would put a fuel additive in to disperse any moisture in the system, I run additives year round in our 5 diesel engines to keep things lubed and injectors clean.....just my 2 cents worth