Gas milage gone to shit?

Hey guys when i recently bought my truck i was getting fantastic gas milage through the city and pretty much anywhere. The day i bought the truck i drove 80 miles from the dealer to my house and the needle never left full. Now im filling up constantly and my gas doesn't seem the same at all idk if im getting even 16 highway and the only mods done are 270/70/17 grabbers no lift or anything and my tanneu cover. Wondering if it's my fuel pump or just if im getting bad gas? Anyone else experiencing this problems on their 2nd gens

 

winter gass mixture. it'll get better in a few months

 

For real copdr? sure hoping

 

Yep, winter gas. Plus takes longer for your truck to warm up which means the truck runs rich for longer. I usually get around 260-270 miles on avg out of a tank in the winter and right around 300 miles on avg in the summer (with the AC on all the time).

 

ya mcgyver that's about what im seeing to

 

Also the tires you put on are alot heavier than the ones the truck came stock with. It has to push more weight.

 

I know this is old but i'm seeing the same thing. I never knew that about gas

 

250 miles to a tank right now... oh well

 

It's the winter blend, as everybody else has said above. BUT i've also seen on mine that eventually the Mass Airflow sensor starts to get dirty and coated. This will cause the sensor to give readings slightly off than what they really are, and will cause it to run lean. This is turn causes you to put your foot into everything a little more causing milage to drop. Get some electrical contact cleaner (leaves no residue) and spray down the sensor really well. You'll notice an increase in throttle response and slightly better milage.

 

Yep, but would like the other blend to start back up because gas isn't getten any cheaper

 

yep feel you guys. gas is hell. looks like time to bust out the rocket in the summer R6 time

 

I just keep my oil and air filter changed and hope for the best.

I change em both at 4k miles usually

 

Looking to get a booster this year