Too bad you needed to buy a new 2009 Frontier.
There are tons of older truck choices that would have gotten better mpg and you would have saved money.
That being said you seem like youre willing to pay a shop for pro aero mods
so a fitted aluminum belly pan would be a winning choice
after that, id look into an aero bed to cover the back
for grill blocks you could have a shop make custom fiberglass inserts to block the holes
that way its removable so you can return to stock
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