Gas mileage

I stuck 6.8 gallons in the tank, and had 121.5 miles on the last tank.

That averages to 17.86 miles per gallon as of today.

I normally get 20 miles per gallon (It's a compact pickup, and I have two bales of straw in the back at the moment. It's a real truck). I need to check the air pressure in my tires. The truck will be due for an oil change in about 800 miles too.