6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis

Disappointed in MPG of my 6.4L

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  #121  
Old 03-15-2007, 04:17 PM
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Strut61: My guess is that the tranny is not in high gear at that speed. My 6.0 2006 will not shift into the top gear until 47mph so at 35 I would get less than at 55.....
 
  #122  
Old 03-15-2007, 04:17 PM
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"No trailer 80 mph 10 mpg
Trailer 80 mph 5.5 mpg
Trailer under 35 mph 5-6mpg
No trailer under 35 7-9mpg"

Looks like it should get about 12 mpg @ 95 mph
 
  #123  
Old 03-15-2007, 04:24 PM
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6.7L Cummins is getting the same mileage
 
  #124  
Old 03-15-2007, 04:40 PM
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Enorma.......Understood, but at 80! come on.......even with 3:73's your taching about 25-2600 rpm and slightly out of the rpms typical of good fuel economy.
All I'm saying is with out all the information, those numbers do not make sense, something is missing
Better mpg at 65mph vs 35mph quite possibly but doubtful at 80mph, IMO.
 

Last edited by Strut61; 03-15-2007 at 04:44 PM.
  #125  
Old 03-15-2007, 04:59 PM
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Originally Posted by BRANDON MORTENSON
Sorry,

No trailer 80 mph 10 mpg
Trailer 80 mph 5.5 mpg
Trailer under 35 mph 5-6mpg
No trailer under 35 7-9mpg

I called Ford's customer service line and they were going to send a tech engineer to Utah to look at my truck. I was just informed that they closed my complaint file because I have 35 in tires on my truck. No engineer will be coming. I have owned 23 Ford trucks 6 6.0, 3 7.3. All of these trucks had 35's on them with 3.73 gears and recalibrated speedo's and they consistantly got 10 w/ a trailer in or out of town and 13 - 16 w/ no trailer in and out of town.

I am extremely disappointed with Ford. Also 6.4 performance in my case is about 80% of what my 6.0's were. I have an 04 6.0 that will runcircles around my 2500 mi 08. If you are thinking of buying an 08, wait and buy a Toyota diesel, the japanese build quality and efficiency, and they care about customers who have bought 23 different trucks from them.
Sorry to hear about your troubles. Does this mean Ford is saying your warranty is invalad cause you have 35" tires? Humm, would think that you would want to break your new truck in with stock wheels then put the 35's on er. I always run them dead stock till broke in then start tweaking things. But you know, I work for EPA and love the concept of a clean air Diesel but was afraid of a loss in fuel eficency in the first generation engines. I think the new SD is an outstanding truck with strenght and quality as well as features not to be found on any other truck but all new first gen D's will suck fuel no matter who makes them till the technology is prefected. Would love to own one.

Good luck. Congradulations on your new truck. I'm sure you will find a dealer that can get this problem resolved for you. You can't be using fuel at that rate unless you have a leak! Can you?
 
  #126  
Old 03-15-2007, 07:58 PM
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I was getting +/- 10.5 without a trailer. I could not wait any longer and started towing today with 800 miles on her. Trailer weight today is about 18k. Will let you know what kind of mileage I get. My driving is almost always a good mix of 75mph highway and city.
 
  #127  
Old 03-15-2007, 08:01 PM
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6.7L Cummins is getting the same mileage
Ok, so I'll stop bashing powerstroke. But seriously, why is it that 20 year old trucks are beating the mpgs of what I would call one of the most (if not the most) advanced diesel engines of our time. The same can be said for the cummins and duramax (dura----max...........very original) diesels. I just don't get why fuel efficiency has been droping off lately. With that kind of fuel economy, whats the point in spending that kind of coin on a diesel?
 
  #128  
Old 03-15-2007, 08:10 PM
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It's my misunderstandings that the EPA (four EGRs and DPF) have something to do with it.
 
  #129  
Old 03-15-2007, 08:35 PM
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It's my misunderstandings that the EPA (four EGRs and DPF) have something to do with it.
You're probably on to something there, the EPA has never been a big fan of diesels. But it seems to me that all the new emission controls are beating the purpose. And then theres the dropping quality in diesel fuel thats been happening for the last decade or so....
 
  #130  
Old 03-15-2007, 08:38 PM
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Yeah well, the mileage may not be up to what some expect ......especially since no one has enough mileage on one to consider it broken in.

EPA has their fingers in way to deep and we will all continue to reap the rewards of what appears to be lower mileage, performance and increased cost of ownership. But ya know, I'm still happy with my new truck, even with the price tag.

My previous 1999 7.3, crew, 4x4, long didn't due much better. My truck before that was a 95 with a 302 that sucked fuel....prior to that I had an 88 with a 302 and it to sucked and my 79 with a 400 was worse yet. Point is, NONE of my prior trucks is half the vehicle this one is, weigh near as much or had even close to the same capabilities.

I'll reserve judgement on the 6.4's mileage potential until such time I hear factual reports from someone with 50k+ miles on one.
 
  #131  
Old 03-15-2007, 08:57 PM
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Yeah well, the mileage may not be up to what some expect ......especially since no one has enough mileage on one to consider it broken in.

EPA has their fingers in way to deep and we will all continue to reap the rewards of what appears to be lower mileage, performance and increased cost of ownership. But ya know, I'm still happy with my new truck, even with the price tag.

My previous 1999 7.3, crew, 4x4, long didn't due much better. My truck before that was a 95 with a 302 that sucked fuel....prior to that I had an 88 with a 302 and it to sucked and my 79 with a 400 was worse yet. Point is, NONE of my prior trucks is half the vehicle this one is, weigh near as much or had even close to the same capabilities.

I'll reserve judgement on the 6.4's mileage potential until such time I hear factual reports from someone with 50k+ miles on one.

All true - especially about the 302 - they should have never put that thing in a truck in the first place (my 86 f150 has one). I am curious to find out what sort of change there would be in fuel economy as these trucks age. But I remember a similar thead a while back about the 6.0L. 19 mpg was what some owners were claiming 500 miles from the show room floor. But that was likely a lighter truck and it had less of the emission controls that the 6.4L has been burdened with. I guess time will tell.
 
  #132  
Old 03-15-2007, 09:58 PM
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towing

Kiminau - how'd the towing go? Handling, starts, stps etc? 18k is a fair whack to lead down the road.
 
  #133  
Old 03-15-2007, 10:50 PM
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My 08 is a crew cab short with 3.73ls. My frustration is simply that this truck doesn't perform or get the mpg that any of my 6.0's had. I replace my truck every year at 25-30K miles because I use it for work and as the family hauler. I have never had good luck with Fords out of warranty and I do enjoy the tax benefits of trading yearly. My trucks are immaculate when I trade them and I don't beat them.(unless you think towing a 7000 pound trailer at 80 is abuse.)
The trailers I tow both weigh 7K loaded, both are enclosed Wells Cargo tandem axles. One is a v nose 27' , the other is a square front(w/nose cone).
I'm not embellishing the numbers. I spent $730 plus driving from northern utah to las vegas last week. When my 04 had 40 miles on it I pulled this trailer to Seattle and got a consistant 10 mpg driving 79.9 miles per hour.LOL
 
  #134  
Old 03-15-2007, 11:15 PM
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I should also add that I've never seen my mpg increase after so many miles. My 04 Excursion has 46K on it and it has the same size lift and tires as my 08. By the way the 04 got 16.8 the other day on a trip averaging 65 mph. It also has 3.73LS. Turning over trucks at 30K mi prevents me from "breaking in" the diesel. I'm glad to see a dodge man be honest about mpg on a cummins. All my dodge friends swear they get 20 mpg to infinity on theirs. BS. My 03 5.4 Expedition gets 8 mpg and won't go any faster than 70 pulling the 27'. (The square front is an 18')
My yearly bill in depreciation and fuel has been 10-13K. Thanks to my 08 it will be 21K plus. This thing should fly to the moon for that kind of money. Maybe I'm just bitter.
 
  #135  
Old 03-15-2007, 11:29 PM
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Originally Posted by socalfurnow
Kiminau - how'd the towing go? Handling, starts, stps etc? 18k is a fair whack to lead down the road.
Went great! Pulled very smooth, very stable. The stopping was excellent! Much better than my 06 250. I am actually pleased with the mpg I am getting. Granted it is not very good, but it is a lot better than what I am used to. Best I ever got with my 06 V-10 was 12 and that was empty highway. I am getting 10+ right now city/hwy mix with a much heavier truck. I expect that may get a little better. Don't get me wrong, I love my V-10 and I think it will get better, it has 53,000 miles on it. When my 2000 Excursion hit 100,000 miles the mpg went up almost 2 mpg. I fully expect that the 6.4 will get better and loosen up when I get a few miles on her.

But back to your question. I love the way it pulls. Even with a 18k lb trailer it pushes you back in the seat when you hit it.
 


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