#1 Cause?
#1 Cause?
Elder User
Joined: Jan 2004
Posts: 803
Likes: 0
From: Bobcaygeon Ont.
Usually bad fuel or winter fuel. Does the truck sound louder(injectors) or more sluggish. I know the one time i got bad fuel my injectors were louder than normal and a loss in performance. My milage sucks now that i'm running winter fuel. Try getting fuel at a differant station next time.
Elder User
Joined: Feb 2004
Posts: 907
Likes: 0
From: West Haven, UT
Winter fuel makes a huge difference. Also letting your truck idle for 10-15 minutes every morning doesn't help. I've noticed the same thing as well. I was averaging close to your 17mpg in the summer, and now, around 14.
Mike
Mike
Elder User
Joined: Aug 2003
Posts: 568
Likes: 1
From: Kansas
Two words..WINTER FUEL...I checked my 03 today and I'm down to 14 from 16.5....done lots of ideling though.
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Elder User
Joined: Jan 2004
Posts: 803
Likes: 0
From: Bobcaygeon Ont.
Yup its the winter fuel than. My 99 got 17-18 in the summer now i'm down to about 13-14 as well. Same story with my dads 2000 and his 98 E350. Once they start summer fuel again you should go back to normall. 
P.S. Driving habits are still the same!
P.S. Driving habits are still the same!
Last edited by lancer; Jan 13, 2005 at 06:00 PM.
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Senior User
Joined: Nov 2004
Posts: 163
Likes: 0
From: Central Montana
Been doing some testing on mileage lately. My first test was 600 miles, 84 mph, 24k rpm, no chip, no fuel additive, got 10.5 mpg. Second test 600 miles, 67 mph, 19k rpm, chip in, fuel additive, got 17.5 Third test, 600 miles, 84 mph, 24k rpm, chip in, fuel additive, got 16.5 mpg. Next test will be chip out, fuel additive in. That will tell me for sure if the additive is improving my mileage but, from what I hear, chips don't really help mileage that much.
Elder User
Joined: Sep 2004
Posts: 780
Likes: 1
From: Chicago suburbs
Drove down to Arkansas and back. Cruse set at 67 on Speedo (75 actual per GPS). Going down I averaged 9.5 to 10.5 MPG on the two fillups. Coming back up for some reason I got 14.8 to 15.5 MPG. I do not know if Arkansas has winter blend or not. Now that I am back up in Illinois, I am getting again about 10 MPG.
Postmaster
Joined: Dec 2003
Posts: 2,864
Likes: 0
From: STEPHENVILLE,TX!!!!!
winter fuel has less parrafin (what gels up) and lower btu rating so less power and economy. thats why winter fuel seems thinner than summer. arkansas probably dosnt run winter fuel, or less of a blend at least