Does my MPG seem low or normal in my Ford Ranger?

I own a 2005 Ford Ranger XLT 4.0 V6 4x4

Okay, yes I know it is a truck so I do not expect fantastic fuel mileage, but I was calculating my MPG with this app I have on my phone, and the average is anywhere between 13.2 and 13.6.

The truck is a manual, so to help with the MPG, I usually shift around 2500-3000, and when I'm just driving I usually have it between 1500 and 2000.

Does anything seem wrong here or is it normal?

Ford Ranger Headlight/Grille Swap?

I have a 1991 Ford Ranger and I was wondering if the 1980-1988 Ford Ranger front headlights/grille are interchangeable with my 91. I really like the old school look the 80s rangers have to them (round head lights). Is this possible?