milage drop

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Dec 1, 2016 | 08:58 AM

dhag911

Thread Starter

Laughing Gas

Joined: Jul 2003

Posts: 893

Likes: 8

From: Lincoln, Nebraska

milage drop

I have noticed that my mileage has dropped over the last year. I use to get 17-19 real easily. now i'm getting 13-15 doesn't matter if its country roads, highway, or interstate. I have sct with matts tunes I have tried all 3 of the tunes with the same results 8k tow has been the one that usually gets a little better mileage. I put about 8k miles on it a year change fuel filters every fall, oil change 5-6k miles, air filter every other year. wondering if there is anything that I should check as to why mileage went down so much.

Dec 1, 2016 | 11:26 AM

Toreador_Diesel

FTE Leadership Emeritus

Joined: Sep 2003

Posts: 12,253

Likes: 763

From: Houston, Texas

Clean your:

MAF
EBPS, tube, and fitting
MAP Nipple

Check:

FICM voltage KOEO, cranking, and KOER.

Monitor:

Fuel pressure
Charging voltage

Fuel:

The normal dry stuff?

biodiesel mix?

Dec 1, 2016 | 12:18 PM

texastech_diesel

Token Redneck

Joined: Jun 2007

Posts: 9,339

Likes: 350

From: Breckenridge, TX

Caliper slide pins are common enough to cause the brakes to drag some

Dec 3, 2016 | 09:33 AM

Mich6.0

More Turbo

Joined: Feb 2005

Posts: 574

Likes: 3

From: Grand Rapids,MI

If your truck is sitting that long, turbo could be sticking , mine locked up the unisom ring so tight it sheared the pin on the actuating rod

Dec 3, 2016 | 03:28 PM

Euroman

Senior User

Joined: Nov 2014

Posts: 1,777

Likes: 1,590

From: France

Brake hoses delaminating caused this kind of mpg loss with me. Also trashed the rear disks...

Dec 6, 2016 | 07:05 AM

Toreador_Diesel

FTE Leadership Emeritus

Joined: Sep 2003

Posts: 12,253

Likes: 763

From: Houston, Texas

Any update?

Dec 6, 2016 | 09:17 AM

IABill

More Turbo

Joined: Nov 2004

Posts: 577

Likes: 12

From: Cumming, Iowa

You live west of me up here in the frost belt you are getting "winter fuel" Different seasonal blends usually less BTU's = lower efficiency so yes you will see a drop in mileage this time of year. Can't explain why the drop in the summer months.....