Jump to content

Recommended Posts

Posted

ive been testing 93 octane in my 6.2 however i'm seeing terrible mpg. i do all city driving, and its around 13.9 and has brought my lifetime down to like 14 or 15.

are you the first one to take off from a red light? If so that's why the mileage is so bad.

 

 

Sent from my iPhone using Tapatalk -

Posted

are you the first one to take off from a red light? If so that's why the mileage is so bad.

 

 

Sent from my iPhone using Tapatalk -

You can't just blame driving style. I had a 5.3 with 3.08 gears and my lifetime over 9000 miles was 14mpg. I would drive with the full intention of getting the best fuel economy possible, but it just wouldn't do it. It did have some good moments here and there, but when I went to a diesel 2500 I broke all my mpg records from that 1500.

 

It's a shitty problem to have because the dealers won't help out because it's easy to blame driving style.

 

 

Sent from my SGH-I337M using Tapatalk

Posted (edited)

I drive on the hard side and don't speed, don't need to in Texas speed limits are high. Im most often first to leave the light, my lifetime average on E85 and some 93 is 16 MPH. Most would be in town.

Edited by KARNUT
Posted

I drive on the hard side and don't speed, don't need to in Texas speed limits are high. Im most often first to leave the light, my lifetime average on E85 and some 93 is 16 MPH. Most would be in town.

I hope you're in the slow lane

  • Like 1
Posted

I hope you're in the slow lane

On the freeway its the Texas speed limit, go with the flow or get out the way.
Posted

You can't just blame driving style. I had a 5.3 with 3.08 gears and my lifetime over 9000 miles was 14mpg. I would drive with the full intention of getting the best fuel economy possible, but it just wouldn't do it. It did have some good moments here and there, but when I went to a diesel 2500 I broke all my mpg records from that 1500.

 

It's a shitty problem to have because the dealers won't help out because it's easy to blame driving style.

 

 

Sent from my SGH-I337M using Tapatalk

Not sure how yours was so low. Did you keep the tires properly inflated and all the other jazz that they say is necessary for good mileage? My 5.3 3.42 4x4 CCSB has had great mileage. My lifetime is 16 mpg. With about 85% of that being city and 15% highway. And about 20% of my overall has been with a lead foot cause it's nice to hear the exhaust!

 

 

Sent from my iPhone using Tapatalk

Posted

Tires were fine and I was 70 percent hwy. I towed a 6x12 enclosed trailer once for 100 miles and got 6mpg.

 

Sent from my SGH-I337M using Tapatalk

Posted

I drive on the hard side and don't speed, don't need to in Texas speed limits are high. Im most often first to leave the light, my lifetime average on E85 and some 93 is 16 MPH. Most would be in town.

 

 

I hope you're in the slow lane

 

 

On the freeway its the Texas speed limit, go with the flow or get out the way.

MPG* The speed limit is over 16 in Texas.

  • Like 1
Posted

 

 

 

 

MPG* The speed limit is over 16 in Texas.

Thanks, I know C~, MPG MPG MPG MPG MPG , Got it. Teacher can I go home now? MPG MPG MPG

Posted

Man I don't know what some of you are doing to get such low numbers.

 

DIC shows almost 20mpg, 25 mile average shows 26mpg, 50 mile average shows 22mpg, 400 mile average shows almost 20mpg. My hand calculated mileage shows anywhere from 18.75-20.5mpg on my weekly commute.

Posted

 

 

My hand calculated mileage shows anywhere from 18.75-20.5mpg on my weekly commute.

 

That's about spot on what I am seeing with my 6.2. It has settled into 18-19 on my normal weekly driving and if I can get out on the freeway for any amount of time it puts me at 20-21mpg.

Posted

What milage are you guys getting with the 5.3 ? I have a 2014 Sierra 1500 All terrain 20" wheels 5.3 4x4 Stickers epa said 16 - 22 I get 16 city and MAX 19 Hwy.....that 22 must be on a dyno at 40 mph.....

 

Sent from my SPH-L720 using Tapatalk

Posted

What milage are you guys getting with the 5.3 ? I have a 2014 Sierra 1500 All terrain 20" wheels 5.3 4x4 Stickers epa said 16 - 22 I get 16 city and MAX 19 Hwy.....that 22 must be on a dyno at 40 mph.....

 

Sent from my SPH-L720 using Tapatalk

EPA sticker on mine said 21 hwy. but I've seen 22-23 cruising between 70-75MPH (not drafting btw, but when I do I get 25MPG). City I can get 16MPG if I play it easy.

 

I've got right around 4600 miles on the truck. CCSB 4x4 with factory wrangler street tires. 275/55/20 5.3L with 3.42 gears.

 

 

Mine used to get around 18-19 mpg hwy. when I bought the truck I got 15-17 on the hwy drive home. But mileage seems to be getting better with more miles.

 

 

Sent from my iPhone using Tapatalk

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Latest Articles

  • Posts

    • Hi, New here.  2026 Denali HD.  Just purchased 7/2/26. I am having the same issue.  I just traded in my 2024 AT4, and the truck connected to bluetooth and Android Auto Immediately!  Now, with the new HD, it connects when it wants to, which is usually not at all.  I have to use the usb-c cable to get it to connect.  Bluetooth won't even connect without the AA. Now after saying all that, I'll take a 20 min drive with the phone plugged in.  Stop at a store, restaurant, etc....  Get back in my truck and DO NOT plug the phone in.  The truck then decides at this point, lets connect BT & AA and work perfectly, ie how it should.   I have deleted (forget phone) the phone multiple times.  I guess I'll just get used to plugging it in every time. even though I don't think its good for the phone battery to have it on charge after it hits 100%. I have searched all over.  No one else seemed to be having this issue, until I read this thread today.   thanks for reading.
    • I have an issue with my ignition hanging and I have to tilt the steering wheel to get in the off position. I have used a great key lock spray and it doesn't help resolve the issue. Is this an ignition assembly issue or something else. If anyone has a past experience with this please advise.   Thanks  Heath
    • This is a terrible GM warranty experience, two months waiting for a covered engine swap with no loaner or timeline is not allowed under GM’s courtesy transport policy.Escalate straight past regular support to a GM executive case manager, document every closed service ticket and dealer repair paperwork. File a complaint with NHTSA to force faster action, and ask for daily rental reimbursement while your truck is down. If it’s been out of service over 30 days, your state lemon law may let you pursue a full vehicle buyback.
    • 198°F isn't unusually hot for an 8L90, so I don't think temperature alone caused the issue. Since everything returned to normal after the truck sat for several days, I'd be looking at an intermittent electronic or hydraulic control problem before assuming the transmission itself has failed. The first thing I'd do is scan the Transmission Control Module (TCM), not just the ECM. GM transmissions can store manufacturer-specific or history codes that won't trigger a check engine light. I'd check: TCM history and pending DTCs Commanded vs. actual gear Line pressure Shift solenoid status Torque converter clutch (TCC) slip Transmission fluid temperature If it happens again, try to capture the data before cycling the ignition, since some intermittent faults disappear after a restart. A professional scan tool that supports full GM transmission diagnostics makes this much easier. For example, the Foxwell NT809BT can access the TCM, read manufacturer-specific transmission codes, and display live transmission data that's not available on a basic OBD-II reader: https://www.foxwelldiag.com/products/foxwell-nt809bt Hopefully it's just an intermittent control issue, but I'd definitely pull the TCM data before replacing any parts.
    • Sorry, I accidentally posted in the wrong language. I'll repost it in English.
  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...