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Old 10-20-2017, 05:32 PM   #1
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Fuel mileage and Ultrapower tune.

First let me say the rig runs great. More power and responsive throttle. I just ran down most of I-5 from the PNW with grades including 152 Pacheco Pass from I5 to the 101. Am now in Pismo Beach. Seems I am getting around 6.5 mpg but I swear on one stint of right around 200 miles through southern Oregon and into California I put 51 gallons in essentially from The Seven Feathers casino in Canyonville to just south of Red Bluff. That seems to me to be right around 4.5-5.0 mpg.

Is there anything else which could effect fuel mileage. Was hoping to see a bump in mpg with the Brazels tune. And I try and do about 60 on the flats but keep the rpm's right above 4,000 on the climbs. Curious what the other 8.1 owners are getting especially those traveling the West.
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Old 10-20-2017, 06:23 PM   #2
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Are you sure you did the math correctly? It sounds low to me, we consistently get around 8.2 mpg with the ultrapower. Admittedly we don't have true mountains in Wisconsin but we do have a lot of hills and flat roads aren't all that common. The best I ever got was 9.8 mpg but I may have had a good back wind for most of the day when I got that and I've never come close to that since then.
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Old 10-20-2017, 07:45 PM   #3
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We are currently at Pismo coast village. Our 8.1 averages around 7.0
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Old 10-20-2017, 08:06 PM   #4
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Fuel mileage and Ultrapower tune.

One of you has a W-20 chassis with Ultra Tune. You other two probably both have W-22 chassis. I have a W-24 and have always avg 6.5-6.7mpg. sometimes less, but after all the fill ups it's in that range. This is doing the math after each fill up. The onboard gauges with real time mpg are promising but not sustainable. The avg mpg on the gauge is pretty close. I find it hard to believe claims over 7.5mpg on chassis W22 and W24 however that some make unless the are driving 55mph. So we really aren't comparing apples to apples.
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Old 10-20-2017, 10:45 PM   #5
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Quote:
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One of you has a W-20 chassis with Ultra Tune. You other two probably both have W-22 chassis. I have a W-24 and have always avg 6.5-6.7mpg. sometimes less, but after all the fill ups it's in that range. This is doing the math after each fill up. The onboard gauges with real time mpg are promising but not sustainable. The avg mpg on the gauge is pretty close. I find it hard to believe claims over 7.5mpg on chassis W22 and W24 however that some make unless the are driving 55mph. So we really aren't comparing apples to apples.
My 34 ft Dolphin weighs 19800 and does 7.5 to 7.6 running the speed limit with the generator running. No toad. I truthfully thought that was terrible. My 98 Daybreak with a 7.4 pulling a trailer and either a car or S10 pickup would do 9 mpg or a bit better. I am kind of disappointed with the fuel mileage with the 8.1
and the allison, but I wouldn't go back to the smaller coach now.
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Old 10-20-2017, 10:57 PM   #6
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We had a 1998 Santara with 460 engine. I could depend on 4.5 to 6.5 mpg even after adding the full Banks kit.
With the present 45' 50,000# MH I'm getting 7.6 mpg over 49,000 miles.
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Old 10-21-2017, 12:07 AM   #7
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You went over the Siskiyou Summit and that sucked up some gas big time.
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Old 10-21-2017, 02:38 AM   #8
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My ultra tuned w22 Itasca gets right at 8mpg on flat ground and in the low 7mpg range when you throw in a few hills. When the hills are 7% or greater the economy drops below 7mpg but not by much. I seldom drive over the speed limit (55-60 in much of Alaska) and i seldom rev the motor to 4000 unless its a steep hill that i really need to scoot up. With few exceptions, i can go up any 7 or 8% grade without exceeding 4000 rpm.
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Old 10-21-2017, 03:06 AM   #9
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Quote:
Originally Posted by Charlie 5320 View Post
My 34 ft Dolphin weighs 19800 and does 7.5 to 7.6 running the speed limit with the generator running. No toad. I truthfully thought that was terrible. My 98 Daybreak with a 7.4 pulling a trailer and either a car or S10 pickup would do 9 mpg or a bit better. I am kind of disappointed with the fuel mileage with the 8.1

and the allison, but I wouldn't go back to the smaller coach now.


My Dolphin is a 37' w24 with a toad or without gets about the same mpg and drive 65mph that's were the 6.5 mpg comes in.
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Old 10-21-2017, 03:46 AM   #10
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My last coach, 2007 Suncruiser on a W24 chassis with Ultra tune, iridium plugs and magnum wires averaged around 7 mpg.

Most of that was driving between east coast and midwest. Pulling mountains thru W. Virginia. If I remember correctly, my best fuel mileage was at 58 mph and I was averaging around 8.5 mpg.

I don't recall pulling any mountains at 4,000 rpm. Seems my best power band was around 3200-3400? Anyway, when I talked to Brazel's they told me a lot of people find with Ultra tune they are not having to keep gas pedal close to floor, thus helping increase fuel mileage.

I found this to be true too. But I did not expect anything more than about .5 mpg increase, on a good day.
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Old 10-21-2017, 10:30 PM   #11
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So I'm probably in the ballpark. Our W22 with toad comes in at 26,000 lbs with full tank and all our crap. I'm using the real time mileage gauge on the dash instrumentation which will show great mileage downhill but wow does it drop heading up a 6%. I bet I'm probably in the 6.5 or so range with all the grades ones needs to navigate especially the north/south west coast trek.

I was probably a little heavy with the gas pedal pulling grades as we were following some friends also in a W-22 rig, but it took me a while to realize they were EMPTY as they were taking their rig to AZ for purposes of selling. Felt I had to keep up and pull those dang hills at 55! Even passed a DP;

Now that they are gone, I shall get back to my more normal leisurely pace. But dang, don't these 8.1's with a 6 speed Allison rock.
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Old 10-22-2017, 07:59 AM   #12
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My Newmar on a W24 averages 7.5 pulling a 4,500 lb toad with the factory tune. I only got less than 7 mpg once on a day with a lot of hills. I have tracked my mileage over 20 K miles so I feel pretty confident in my numbers. I also try to keep my speed at 60 mph. Of course I am not driving the mountains in the west but have been through the Appalachian mountains and Green mountains several times.
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Old 10-22-2017, 09:39 AM   #13
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Just reached 7.2 gal/mile. Aired up to100 psi cold, still looking for great ways to get rid of petroleum fuels, one gallon at a time.
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Old 10-22-2017, 10:32 AM   #14
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My Newmar on a W24 averages 7.5 pulling a 4,500 lb toad with the factory tune. I only got less than 7 mpg once on a day with a lot of hills. I have tracked my mileage over 20 K miles so I feel pretty confident in my numbers. I also try to keep my speed at 60 mph. Of course I am not driving the mountains in the west but have been through the Appalachian mountains and Green mountains several times.


I suppose 60 or less is the key. I drive 65 most trips sometimes it Kreaps up on me 6.5 mpg avg per trip.
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