Question on MPG
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From: south of ST.L
Question on MPG
I had about 40xxx miles since last tune up. When I first did it, when I bought the truck. My best mpg was about 290 miles out of one tank (driving slow). Over time it has dropped went down to about 220 miles per tank. So I went and did a complete tune up. (Plugs, wires, cap, rotor, PCV valve, and cleaned out the K&N filter.) After doing this, it got worse! I was getting about 200 or less per tank. It did this for about 8 tank fills.
Today I swiched over tanks and checked my mileage and I got 265 miles out of one tank. Which is very good I think for the way I drive, 80mph on higway 40 miles a day. And stop and go 25 miles a day. (I got around 15-16 mpg) NOW what do you think went wrong here? EGR maybe? I know its original. As far as injectors, distributor, there all new within the past 15000 miles. I have 189,xxx miles on the truck now. Let me know what your take is on this. I would like to get this fixed. This $3.00 a gallon sucks. [img]images/icons/icon8.gif[/img] What is all of your typical MPG, differences after tune ups?
Today I swiched over tanks and checked my mileage and I got 265 miles out of one tank. Which is very good I think for the way I drive, 80mph on higway 40 miles a day. And stop and go 25 miles a day. (I got around 15-16 mpg) NOW what do you think went wrong here? EGR maybe? I know its original. As far as injectors, distributor, there all new within the past 15000 miles. I have 189,xxx miles on the truck now. Let me know what your take is on this. I would like to get this fixed. This $3.00 a gallon sucks. [img]images/icons/icon8.gif[/img] What is all of your typical MPG, differences after tune ups?
Post Fiend
Joined: Mar 2004
Posts: 24,418
Likes: 3
From: San Francisco, Ca.
subnet76, It's best to write down your mileage between fillups, and then devide by the number of gallons you use.
Every tune-up I've done hasn't made much of a difference in my MPG.
I use to get 20-21 highway, but that dropped to around 18 when I went to bigger tires and a lower rear end ratio (from a 2.75 to a 3.50)
Did you change your fuel filter?
Every tune-up I've done hasn't made much of a difference in my MPG.
I use to get 20-21 highway, but that dropped to around 18 when I went to bigger tires and a lower rear end ratio (from a 2.75 to a 3.50)
Did you change your fuel filter?
Last edited by sierraben; Jul 13, 2006 at 11:45 PM.
Post Fiend
Joined: Mar 2004
Posts: 24,418
Likes: 3
From: San Francisco, Ca.
Any need to go 80mph?
That puts a damper on your gas bill.
, but gas is going to rocket towards the $4.00 mark soon, IMHO.
Did you check the timing?
I don't know anything about the new trucks, but is there an oxy sensor?
That puts a damper on your gas bill.
, but gas is going to rocket towards the $4.00 mark soon, IMHO.Did you check the timing?
I don't know anything about the new trucks, but is there an oxy sensor?
Last edited by sierraben; Jul 14, 2006 at 12:18 AM.
Thread Starter
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Junior User
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From: south of ST.L
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Post Fiend
Joined: Mar 2004
Posts: 24,418
Likes: 3
From: San Francisco, Ca.
subnet76, Maybe you should post your problem in the "2004 F150, 2005 F150, 2006 Ford F150" forum.
You might get more/better responses.
You might get more/better responses.
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From: Broken Arrow, OK
Which tank gets 200 and which gets 260? There is a problem wit the dual tank system that allows fuel to be pumped from one tank to the other while driving. If the tank is full it just shoves it out the filler neck and it's lost. The rear tank on my truck siphons gas out the filler at speeds over about 70 mph. It will suck out nearly 1/3 tank on a 4 hour drive. To fix it I just make sure I empty the rear tank first.
