I think my fuel mpg has gotten worse

Maybe I’m crazy but I think my fuel economy has gotten drastically worse. I usually get 21 mpg on the high way, now I’m getting 18.

stock tires
Stock psi
No mods

 

how far and fast are you driving when you're getting these measurments?
Is your speed consistent, CC, step on the gas to pass someone? etc etc..
I drive the same route to work everyday on the freeway, some days i can get 24mpg, other days i can get 18-19mpg, all depending on how i drive.

 

Oil change helps too

 

Wind direction is a major factor for these rolling bricks.

 

60 mph, maybe 70 for a couple seconds. Usually I get 21 mpg, but lately 18.

im making an appointment to get the fuel pump recall done, maybe they can check it out, maybe they won’t.

 

Absolutely!
I just took the work F150 down to the farm, and headed back today. 80 of the110 miles in to a decent 10-15 mph wind, so I got about 2-3 less than usual.

 

Clean the maf, maybe (perked mine right up even if it is still the slowest vehicle on the Planet)

 

Check your air filter.

Also, this goofy predictive software changes up how the engine responds from time to time. It seems like it takes a solid month of granny driving before you get good mileage.

 

Do you log it? I have logged my tank fills in every car I’ve owned and that allows me to track mileage to behavior to winter mix to conditions with much accuracy and trend.

 

Just drive! I try to maintain 80 in SoCal and get 18.8 all day long.

 

Apparently these trucks foul the spark plugs quite quickly, might wanna check those too

 

Tighten the air intake ducting, a smidge. Switch out the rear diff oil. Check parking brake cable

 

Put your wallet in you opposite pants pocket and trim your eyebrows that got me an extra 1mpg.

 

Well if i'm heavy on the go pedal my fuel milage will dip to under 20 mpg.

 

You are forgetting paint wax, the truck will glide smoother trough the air, another 1 mpg right there.

 

I avg 19.5 in flat florida running 70-75 . I’ve noticed it also depends on the vehicle your following .

 

Disconnect the battery for a while and see if a reset sorts it out, or if your crazy.

 

get it tuned!

 

Find an independent mechanic with a deluxe scan tool that does more than checking CEL codes. It can tell you if your injectors are dirty , it’s running too rich, the cat is clogged, etc.

 

Bought my ‘13, 4.0 double cab, five weeks ago. Tracked in town mileage for 125 miles: 15 mpg. Today, drove west on I-10 against strong winds and back, 100 miles total= 22 mpg. But I don’t give a crap...glad to have it no matter the mileage. Don’t plan on long trips in it.