Go on autos.msn.com
Look up your vehicle and it'll show you much more than just your mpg.
12 to 18,not good
15-19 & 17 combined but you have to consider miles & engine condition.
www.fueleconomy.gov
Got me by the sneakers you're the one with the truck and piece of paper to figure it out.
Fill the fuel tank full and write down the mileage on the odometer. Drive the truck till the low fuel light comes on and fill the fuel tank and write down the number of gallons and tenths of gallons it took to fill it divide those gallons into the miles traveled between the new odometer reading. number
How many mpg on my 06 silverado 2500hd 6.0 extended cab gasoline