2001 GMC Sierra Poor fuel mileage

WATERGUYSID

MEMBER
2001 GMC SIERRA
V8
4WD
AUTOMATIC
59,000 MILES

I have a 1500HD w/ 6.0L. What would cause my mileage to drop to 8.5-9 mpg from 10.5-11? I changed the plugs, and went to synthetic oil, nothing seems to help.

Wednesday, August 6th, 2008 AT 5:29 PM

1 Reply

BLACKOP555

MECHANIC
10,371 POSTS

You can change the air filter, and check to see if the tires are inflated properly, also make sure the brakes arent dragging.

I woudl suspect a issue with the o2 sensor, due to its not that much of a decrease.

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

Wednesday, August 6th, 2008 AT 10:12 PM

Please login or register to post a reply.

Related Engine Poor Mileage Content

Poor Gas Milage

Poor Gas Milage. 1997 Gmc 4x4. 350 Engene

Asked by spotless ·

5 ANSWERS

1997

1995 Gmc Sierra Higher Than Normal Idle When Engine...

For The Last Few Weeks My Engine Runs At A Higher Than Normal Idle Speed When It's Cold. It Normally Runs At 1000 Rpm When Warming Up;...

Asked by Dasyscyphus ·

2 ANSWERS

1995

Gas Mileage For A First Car

Is Fifteen Or Lower Mpg Good Gas Mileage For A First Car?

Asked by Zackery Ragel ·

1 ANSWER

2013

Cranks Won't Start

Cranks, But Won't Start. In The Past The Security Light Would Come On While Driving, And It Would Start Some Times And Other Times Crank...

Asked by 427marlerz ·

29 ANSWERS

2001

2001 Gmc Sierra Stalling At Idle

My 2001 Gmc Sierra (about 130k Miles) Is Intermittently (becoming More Frequent) Stalling At Idle. Generally If It Starts Ok At First I...

Asked by greggestey ·

5 ANSWERS

2001

Sponsored links

Ask a Car Question. It's Free!

SPONSORED LINKS

Code Read Retrieval/Clear Mercedes Benz

Code Read Retrieval/Clear Mercedes Benz

Replace Mass Air Flow Sensor Kia Sportage

Replace Mass Air Flow Sensor Kia Sportage

Code Read Retrieval/Clear Mercedes-Benz C230

Code Read Retrieval/Clear Mercedes-Benz C230

Online car repair manuals

Online car repair manuals

© 1999 - 2024 2CarPros, Inc.