Mileage coming up - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 09-17-2007, 08:41 AM Thread Starter
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Mileage coming up

as more miles are collected on these is the mileage getting any better?

2003 F350 Dually 6.0
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post #2 of 7 Old 09-17-2007, 01:50 PM
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I have a super cab with a 3.73 rear and I'm getting 14.4 mpg. I only have 1100 miles on it. Only time will tell if it get better.. I would like to see around 17 mpg.
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post #3 of 7 Old 09-17-2007, 02:03 PM
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i have heard rumors that some Diesel engine get better MPG's as they gain mileage on the odometer. mine is not one of them. i got mine at 46k, now has 135k and still getting low 16's on the MPG.

i have a 4spd auto 4x4 with 4.10 rear.

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post #4 of 7 Old 09-17-2007, 02:29 PM
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I have 3.73 gears in my 6.0L with 13,700+ on her. I get at least 19mpg but I use the calculation method and not dependent on the onboard computer telling me 16. something all the time. From stock it has always told me the same mpg! Something just aint rite there! Hope Ya Get Yers Figured Out Though!! I have also herd these diesels only get better! GOOD LUCK!!

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post #5 of 7 Old 09-17-2007, 02:35 PM
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Quote:
Originally Posted by sldghamr View Post
i have heard rumors that some Diesel engine get better MPG's as they gain mileage on the odometer. mine is not one of them. i got mine at 46k, now has 135k and still getting low 16's on the MPG.

i have a 4spd auto 4x4 with 4.10 rear.
I think he's talking about the 6.4 not the 6.0 or 7.3's.

At 46k you are fully broken in and getting the best milage your going to see. I beleive he more wondering between the 10 and 20k range on the 6.4 liter.
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post #6 of 7 Old 09-17-2007, 03:02 PM
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Ours went down to a worst of 5.3 at about 3K It then went up to a high of 7.8, now its settin steady at about 6.5 with almost 6K on the clock. PS, it's a 550 with 4.88's and hauls every day, usually 20-25K lbs.

It got about 13 both times it was driven with no load.

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post #7 of 7 Old 09-19-2007, 01:15 PM
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Almost 6K on the 6.4 now, still runs around 8.5-9.0 in town and around 11.5-12.0 on the highway. Have been running the Ford Cetane boost for the last three tanks, I see no difference. I am also still disappointed in the low power.

I think that the poor 6.4 performance has caught up with Ford, the local dealer tells me that they have sold very few in the last couple of months and now they have $3000 rebates on the ones in stock. Early on they could not get any for stock and now they have over 20 available.

Mine has been in the shop eight times since April!

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