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for the mileage, i would try the basics, like clean the TB, replace the spark plugs, maybe air filter if the dealership didnt do it already. and you need to give us a number for mpg or how many gallons it took to fill it back up, not just 163 miles. that number alone doesnt tell us anything.

as for the oil, jecht is right. unless your engine has 200k on it and its completely packed with sludge, its not going to greatly affect your fuel mileage. fuel mileage is dependent on the fuel system condition itself, how you drive, weather conditions, etc. not what kind of oil is in your truck.
 
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