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15w40 Delvac 1300 in 300 during extreme winter you are hurt engine.
Use 5w40 diesel oil.
13 mpg it must be mistake.
Check brake to make sure it not drag.
I wouldn't use steel flatbed it heavy than you think. I have one on F250 it weigh more than normal bed. Use aluminum flatbed would be much better.
Did you add vacuum gauge that what make huge difference in mpg
You need scanner to check codes in computer. They don't turn on engine light but codes hide. My 95 F250 don't have engine light on but drive awful.We hook to scanner it show lot errors codes after fix some sensors then work great.
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