Since buying the truck, I have recorded every gas purchase into an excel spreadsheet. Recording price per gallon, gallons purchased, cost, date of transaction, transaction number, etc. Then calcing mileage of last tank of gas & over all mileage. My overall mileage is very slightly over 16 MPG. I do not drive the vehicle hard and my driving is a mix of highway & city. When I have driven a full tank of almost all highway I only got 15.871 MPG.
Simple truck with some creature comforts. And it doesn't take up the whole garage.