Your FG problems come from inexperience. Better would be just seal it with epoxy meant for sealing wood then just sanding, painting it.
Next on aero you need smaller LRR tires with more air pressure and lower the whole truck quite a bit would do as much or more increasing mileage as the cap. Then an air dam or belly pan can help.
Wheel wells are your next big mileage stealer which need a lot of work on yours as they are bad. Remove the flares, put rear wheel skirts will give you a 10% mileage increase.
Nice looking and a good start.
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