MPG's WAY Down !

[HECDOGGIE]

Truck : 2014 GMC Sierra - 5.3

When i first bought this bad boy, my average was 17.8 city - Highway was 22 avg
NOW , that gas prices are super low, my average is 13.6 city -

Im guessing lower prices, crappier fuel.... Is it a diversion ? What are we missing.

I know wintergrade has something to do with it, but not 4 mpg

[Buick355]

I've got the same truck. I haven't noticed much of a change in my mpg's.

[mstng86]

change your air filter?

[Ted]

I have a 2013 5.3 and mine has remained at 15.3 the whole 45k miles.

[Binky]

replace your Air filter, change your plugs. Reset the computer to relearn its map.

[Binky]

However the easiest is to get your gas from somewhere else. - see if your supply is shit

[HECDOGGIE]

However the easiest is to get your gas from somewhere else. - see if your supply is shit

Good point... no more racetrak

[snacksnack]

Cheaper gas, heavier right foot=shittier mileage. At least this is my case.

[ceyko]

I recall being able to get 37-40 mpg in my accord when just cruising at 60-65. Now it seems like I'm lucky to see 34-35. I'm averaging 30mpg now, when it used to be 33-35.

It's a minor decrease, but I'm also not sure if it is my car, gas or something else. I use cruise control to eliminate my error/variables - but it's difficult to be 100% sure since traffic screws it all up. Still, on a fresh tank (recently had filters changed...etc...etc) it seems like it is less overall.

[jimithing]

Winter fuel mix to will give you less MPG. Bad O2 sensor can do something similar but you'd prob get a CEL and notice poor performance.

[lincolnboy]

Use higher octane.

[John -- '02 HAWK]

change oil, air, and fuel filter?

[71chevellejohn]

2015 Sierra w/5.3.

My mileage dropped with the temperature. On the days it's been below freezing, I've lost 2-3mpg. When the temp has come up, it's been back up to normal.

[krazy kris]

I've noticed a big difference since the price drop as well back in October I could go to Ranger and back and use just under 1/2 a tank now it's taking almost 3/4 of a tank. That's when I was hualing all kinds of building materials, feeders, ect. Now I don't hardly take anything other than clothes, sleeping bag, guns, and ice chests.

[ELVIS]

truck have auto start??

god bless.