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Old 01-17-2011, 08:15 PM
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Dually mileage

Just wondering what all you dually guys are getting for mileage thanks for all your help
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Old 01-17-2011, 10:20 PM
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i get just over 500 miles to the tank city and 650-700 highway depending on the load, although i've never run too low on fuel i've only seen the low fuel light ever come on twice.
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Old 01-17-2011, 10:40 PM
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I took a 300 mile trip a few weeks ago and stayed on 75 MPH most of the trip, fueled up and by hand I got 12.9 MPG. I think that sucks.

Doug
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Old 01-18-2011, 03:55 AM
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In town I get 12.5 mpg, highway 14 mpg. I have a 3000 lb trialer I haul my bikes in an took a trip to Florida for Christmas (1025 miles) and averaged 12 mpg.
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Old 01-18-2011, 03:58 AM
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I get about 16-17 on the highway if I keep it at 2k on the tach and I am in xrace. Since I generally don't do that I see about 14 unloaded and about 12 pulling my 35' Travel Trailer. I don't think it it is bad since I am turning 6 tires with 4:10 gears.
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Old 01-18-2011, 05:03 AM
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Mines not a dually but this is what i have learned on these 6.0s

Keep is under 1750 RPMs.

Ive done a lot of free way running this past winter 10K half with nothing on my rig and the other half with anything from a 2K 17 ft Bayliner boat to Rinker 28ft 13K boat and all the RVs between 18 and 30ft bumper style pulls.

When unloaded at 67mph <1750rpm> i always get 18 to 20 and i have a 5sp automatic.

Run that RPM to 2K or 70 top 75mph and it drops right down to 15 to 17mph pretty fast.

Hauling i tend to stay right at the 65 MPH mark and i can stay in 5gear except for the larger hills and i average 10 to 12 for everything i haul.

Now that 28ft Rinker kept me at 2300 RPM for 500+ miles of hauling and i only averaged 8 mpg.
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Old 01-18-2011, 05:13 AM
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Quote:
Originally Posted by mmandley View Post
Mines not a dually but this is what i have learned on these 6.0s

Keep is under 1750 RPMs.

Ive done a lot of free way running this past winter 10K half with nothing on my rig and the other half with anything from a 2K 17 ft Bayliner boat to Rinker 28ft 13K boat and all the RVs between 18 and 30ft bumper style pulls.

When unloaded at 67mph <1750rpm> i always get 18 to 20 and i have a 5sp automatic.

Run that RPM to 2K or 70 top 75mph and it drops right down to 15 to 17mph pretty fast.

Hauling i tend to stay right at the 65 MPH mark and i can stay in 5gear except for the larger hills and i average 10 to 12 for everything i haul.

Now that 28ft Rinker kept me at 2300 RPM for 500+ miles of hauling and i only averaged 8 mpg.
What you are suggesting works great when you have 3:73's and two less tires. We have a lot more rolling resistance right off the bat. If I was to keep my rpm's that low I would be about 55mph. At 2k I am between 60-65mph. Just pointing out a few of the differences.
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Old 01-18-2011, 05:17 AM
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Quote:
Originally Posted by westcoaststrokin View Post
What you are suggesting works great when you have 3:73's and two less tires. We have a lot more rolling resistance right off the bat. If I was to keep my rpm's that low I would be about 55mph. At 2k I am between 60-65mph. Just pointing out a few of the differences.
True that sir i hadn't thought about the 4.10s.

I am a little baffled as to why it doesn't matter if im pulling a 2K load or a 10K load < uhaul car carrier and a Expedition > as to why i always get the same mileage 10 to 12. I really would like to think lighter loads mean better mileage, it just feels like as soon as she feels a trailer on her hitch she says ohh 12 MPG that's it buddy LOL.
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Old 01-18-2011, 07:14 AM
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Quote:
Originally Posted by westcoaststrokin View Post
I get about 16-17 on the highway if I keep it at 2k on the tach and I am in xrace. Since I generally don't do that I see about 14 unloaded and about 12 pulling my 35' Travel Trailer. I don't think it it is bad since I am turning 6 tires with 4:10 gears.
That's what I'm seeing also^^^^^^

I look at it this way, my truck weighs 8240k and average 16-17 highway. My '95 Ram 3/4 ton gasser weighs 6080k and averages 10-12 highway. That's not bad for a truck that weighs 2k more than a gasser.
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Old 01-18-2011, 09:36 AM
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Our truck is 2004 F350 Crew Cab DRW with 4.10 differential ratio. Without a load we get 16 to 17 MPG. Hauling our 16k# 5er, we get 10 to 11 MPG. I have found the "sweet spot" to be around 60MPH therefore hitting 2000 RPM or less. When/if I push it to 65+, the MPG drops to 8 or 9. And besides, I don't like hauling that size rig faster that 60ish.

I'm considering/pondering an air deflector to see if that helps improve MPG while hauling. I would think anything that would help to lift air over the camper instead of it hitting the "parachute" behind me would be beneficial. But right now, the coins aren't there and I have other things to get first.
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