Help with EXTREME fuel consumption?

I am a fairly new owner to a 2012 F-150 XLT super crew cab 3.5L eco boost with 220k on the dash, and I need some help.

My truck has been getting 14-15 mpg for about 1k miles now since I bought it however very recently, within the day, it went to about 4 mpg.

I was driving just fine and stopped for dinner at 185 miles to E then when I got back in the truck it showed 60 after running for a few minutes it went to 14 and drove to a gas station. From dinner to gas station which is about a mile it actually climbed to about 70 then I filled it to 285 and from my 12 mile drive home it lost 53 miles to E. It felt semi-sluggish and I could tell something was wrong on the way home.

After getting home I decided to check under the truck and in the bay and smelled no gas seen no gas and couldn’t feel any at all on the lines and on the top of the tank.

Any help as to why this may be happening is appreciated. Thank you