Horrible gas milage 24L/100km??

[geoprz]

I have a 2015 1500 Sierra SLT Crew Cab with 6000km on the struck now.

 

Mods: 1 inch level, 33inch tires and thats it.

 

Prior to these mods I was still in the 22-23L/100km range. This can not be right. Ive spoken to many other 15' Sierra drivers and they keep telling me somethings wrong with my truck since they get around 15L/100km. I am not a fast driver at all, my truck barely govers over 2500rpm before it switches.

 

I brought this issue up with my dealer and they said its normal and its the break in period time. I believe thats nonsense. I highy doubt after break in period my gas consumption will change that drastically. Its ridiculous when my gas light comes on when ive reached 370km for that tank.

 

A few things I noticed. This damn thing barely switch to V4 it seems like its always in V8. On the highway with the cruise on at 110km it stays in V8! When im coming to a stop and let go of the gas then it goes to V4 and as im sitting at a red light it goes into V8 automatically??

 

Can someone please tell me whats going on? I havent heard one person having this issue.

 

Thanks

[newdude]

There is a fuel mileage increase over a bit of time, it has to adjust to your driving style. As for AFM, it is supposed to kick back into 8 cylinders below certain speeds, and when stopped. Have you tried running stock tires for a long distance? How long have you had the 33" tires on? Also, do you remote start alot? I assume you may be a Canadian resident...

[nards444]

Chances are its your driving habbits, whether you like to admit it or not, also long periods of idling can hurt MPG.

[geoprz]

Impossible to be blaming it on my driving habits. What I wrote does not make sense? And the way my V4/V8 system switches sounds normal to you guys?

 

Believe me when I say I drive the truck in a proper manner. I mentioned how I took the truck on a road trip on the highway doing 110km on cruise control. It burned 24L per 100km and I barely got 400km for that tank before I had to fill up and continue.

 

My neighbour has a 2015 Ford F150 V8 and he beats on it and gets 16L/100km he laughts considering the way I drive and I have worse stats then him.

 

What are you guys getting??

[gone_fishing]

The winter fuel plus cold weather takes it's toll on fuel economy. Once it starts warming back up it will improve.

 

BTW, do you have LT tires?

[nards444]

Impossible to be blaming it on my driving habits. What I wrote does not make sense? And the way my V4/V8 system switches sounds normal to you guys?

 

Believe me when I say I drive the truck in a proper manner. I mentioned how I took the truck on a road trip on the highway doing 110km on cruise control. It burned 24L per 100km and I barely got 400km for that tank before I had to fill up and continue.

 

My neighbour has a 2015 Ford F150 V8 and he beats on it and gets 16L/100km he laughts considering the way I drive and I have worse stats then him.

 

What are you guys getting??

Not a canadian, but I get 16ish regular, and almost 20 highway with a 4x4 with 3.73 gearing.

Impossible to be blaming it on my driving habits. What I wrote does not make sense? And the way my V4/V8 system switches sounds normal to you guys?

 

Believe me when I say I drive the truck in a proper manner. I mentioned how I took the truck on a road trip on the highway doing 110km on cruise control. It burned 24L per 100km and I barely got 400km for that tank before I had to fill up and continue.

 

My neighbour has a 2015 Ford F150 V8 and he beats on it and gets 16L/100km he laughts considering the way I drive and I have worse stats then him.

 

What are you guys getting??

Not a canadian, but I get 16ish regular, and almost 20 highway with a 4x4 with 3.73 gearing.

[Kuff]

I would say something is wrong for sure. With my winter tires on steel rims (which weigh a ton) and winter gas I am averaging 15.5 L/100KM and thats a 50/50 mix of highway and city driving approx 110-120KM/h on the highway. With the stock wheels and all season tires I will average 12.5 L/100KM.

 

Hell even towing my travel trailer which is 26 feet long and weighs 6600 lbs loaded I get 21 L/100KM.

 

The whole break in period is kind of bull shit. I am at 35,000 KM and it maybe improved by 0.5 L/100KM.

 

 

FYI 5.3L crew cab SLT with 3.42 gears

[geoprz]

I would say something is wrong for sure. With my winter tires on steel rims (which weigh a ton) and winter gas I am averaging 15.5 L/100KM and thats a 50/50 mix of highway and city driving approx 110-120KM/h on the highway. With the stock wheels and all season tires I will average 12.5 L/100KM.

 

Hell even towing my travel trailer which is 26 feet long and weighs 6600 lbs loaded I get 21 L/100KM.

 

The whole break in period is kind of bull shit. I am at 35,000 KM and it maybe improved by 0.5 L/100KM.

 

 

FYI 5.3L crew cab SLT with 3.42 gears

 

Finally someone agrees. I was getting worried. I know this isnt right. And so far im pissed with my purchase. I picked this over the F150 Ecoboost because of the gas milage claims by GM on the Sierra.

 

Im going to the dealer today to switch out my defective headlights because of the condensation inside and I will bring this issue up again and demand something must be done.

[BigBadSierra]

Mine dropped to 15L/100km the second the winter gas came out.

 

I was able to put some summer gas in it from a friends farm tank and my millage went right back to what I was getting 12.5/100K despite the cold weather. This 5.3 hates winter gas, hates-hates-hates it.

[redwngr]

Which engine?

[nards444]

 

Finally someone agrees. I was getting worried. I know this isnt right. And so far im pissed with my purchase. I picked this over the F150 Ecoboost because of the gas milage claims by GM on the Sierra.

 

Im going to the dealer today to switch out my defective headlights because of the condensation inside and I will bring this issue up again and demand something must be done.

There could be. 9 out of 10 times you go to the dealer or people do for this, they are going to tell you mechanically its fine, and its your driving habits. Then they are going to see your tires and lift and blame it on that. Chances are they are going to tell you to pound sand.

 

But you have a warranty and it doesnt hurt to get it checked out, could be something simple as a reflash of the DIC

 

Finally someone agrees. I was getting worried. I know this isnt right. And so far im pissed with my purchase. I picked this over the F150 Ecoboost because of the gas milage claims by GM on the Sierra.

 

Im going to the dealer today to switch out my defective headlights because of the condensation inside and I will bring this issue up again and demand something must be done.

There could be. 9 out of 10 times you go to the dealer or people do for this, they are going to tell you mechanically its fine, and its your driving habits. Then they are going to see your tires and lift and blame it on that. Chances are they are going to tell you to pound sand.

 

But you have a warranty and it doesnt hurt to get it checked out, could be something simple as a reflash of the DIC

[Mytruenorth]

Finally someone agrees. I was getting worried. I know this isnt right. And so far im pissed with my purchase. I picked this over the F150 Ecoboost because of the gas milage claims by GM on the Sierra.

 

Im going to the dealer today to switch out my defective headlights because of the condensation inside and I will bring this issue up again and demand something must be done.

Something doesn't sound right, I'm getting 17-18 on my brand new Silverado and I idle a lot using the remote start in the morning and at work in the parking lot having coffee/breakfast before I go inside the building. I probably idle the truck more the usual considering the brutal cold we've been having since I bought the truck a couple of weeks ago and I'm not nearly as high as you. As far as driving habits go, I guess you could say that I don't have a lead foot and I'm not an aggressive driver at all. I always get where I'm going early, hence all the idling. That said, it's a new truck with the 5.3 so on those rare days when the sun been out and the roads fairly dry I have been punching it on occasion just to see what it's got but I don't think I've ever hit 19 per 100k on mine.

 

Any chance that your new rubber is rubbing? I'm also curious about the brand of tire on your truck, I'm running the Dueler AT on mine.

[Mytruenorth]

Sorry for the multiple posts, something weird going on!

[jonny24]

I'd say something might be wrong. Mine was never the greatest, but nowhere near as bad as you.

 

~10 000 km

No lift, level, or big tires

Most days I start it for 10 minutes, then drive 15 to work, same on the way home.

 

It's been around 17-18 L/ 100 km. But I get on longer drives, highway around 110 km/h and even long flat county roads going ~90 it'll drop back down to 13 L / 100.

[Mytruenorth]

Finally someone agrees. I was getting worried. I know this isnt right. And so far im pissed with my purchase. I picked this over the F150 Ecoboost because of the gas milage claims by GM on the Sierra.

 

Im going to the dealer today to switch out my defective headlights because of the condensation inside and I will bring this issue up again and demand something must be done.

Something doesn't sound right, I'm getting 17-18 on my brand new Silverado and I idle a lot using the remote start in the morning and at work in the parking lot having coffee/breakfast before I go inside the building. I probably idle the truck more than usual considering the brutal cold we've been having since I bought the truck a couple of weeks ago and I'm not nearly as high as you. As far as driving habits go, I guess you could say that I don't have a lead foot and I'm not an aggressive driver at all. I always get where I'm going early, hence all the idling. That said, it's a new truck with the 5.3 so on those rare days when the sun has been out and the roads fairly dry I have been punching it on occasion just to see what it's got but I don't think I've ever hit 19 per 100k on mine.

 

Any chance that your new rubber is rubbing? I'm also curious about the brand of tire on your truck, I'm running the Dueler AT on mine.