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Old 04-11-2017, 07:22 AM   #15
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Originally Posted by twojayhawks View Post
I am interested in knowing an approximate (max) cruising range for my coach. I have a mpg number (7.3) based on 2 years & about 15K miles. However I really don't know how many gallons are actually in the tank after a garden variety fill up. My thoughts are the 150 gallon tank that Freightliner uses in my XCR chassis probably has an actual usable of something less than 150 gallons. However is it actually rated to fill to 140?, 130?, 120? If anyone has any knowledge on this I would like to know. Thanks!
Just work backwards till you are comfy - for me I'll do 800 miles per fill up keeping an eye on the next station - once put 142 gallons in my 150 gallon tank - close to running out so - just work it to where you are good.

As we travel I usually have the fill spots scouted out from Gas Buddy - so don't get caught in the Desert with only 50 gallons, JMHO.

Enjoy the Coach,
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Old 04-11-2017, 08:44 AM   #16
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I use the trip information on the silverleaf to determine fuel used, it is spot on. As far as filling, I use the air bags and raise the coach on the driver side and fill the last 10 gallons or so by hand very slowly and watch the fuel in the filler neck to avoid spilling. Takes a while, but after 4 to 7 hours driving, I'm good with taking the extra time to fill to the top.
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Old 04-11-2017, 09:34 AM   #17
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If you can't get an honest answer as to the capacity of tank, you can measure the tank
Length, width and height then compute the cubic inches by multiplying L x W x H to get the cubic inches then divide by 231 (there are 231 Cubic Inches in one gallon)

As an example lets say your fuel tank is 50 inches long by 20 inches tall and 20 inches wide 65 x 27 x 20 = 35,100 35,100/231 = 151.94 gallons
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Old 04-11-2017, 10:46 AM   #18
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My tank says it holds 150 gallons. I have read that manufacturers rate their tanks by total volume, only some will list the draw capacity. The base of my filler neck sits a few inches below the top of the tank. Recently was filling the tank on a level surface and thought just for the heck of it I would lean the coach away from the pump after I had gotten it as full as I could. I was shocked that after leaning the coach as far over as possible I got another 30 gallons in. Due to expansion I would only risk doing this if filling in the morning and immediately taking off though.
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Old 04-11-2017, 10:56 AM   #19
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Dutch Star Don

you only have a 100 gal tank on your 2015 DSDP??? I think it has a 150 gal. tank??? Re-check your specs.
I have filled several times immediately after the 'Low Fuel' warning light comes on - I generally get 120-125 gal. in the tank. That gives me ~ 25-30 gals remaining which would get me another ~150-175 miles down the road if necessary. One time I had to run it 112 miles after the 'Low Fuel' light came on! That had me sweating a little! Never want to run a diesel dry!!!!!!

As far as foaming when filling with diesel - I always slow down the pump GPM speed when I hit 100 gals & take it slower on the last 20-25 gals so as to prevent a foaming burp!

Happy Trails
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Old 04-12-2017, 04:25 PM   #20
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Bill

Only the 43 and longer have more than 100 gal On the newer models, my 99 40' had a 150 gal tank.
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Old 04-12-2017, 04:28 PM   #21
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I put 149 gallons and change into my 150 gal tank.
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Old 04-12-2017, 07:49 PM   #22
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I usually don't let my 100 tank get much below half for many of the same reasons mentioned above. But mostly because buying 50 gallons seems less painful than 80 or 90 gallons.

Safe travels!
Cheers
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Old 04-14-2017, 10:00 AM   #23
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Quote:
Originally Posted by ScottyA View Post
I use the trip information on the silverleaf to determine fuel used, it is spot on. As far as filling, I use the air bags and raise the coach on the driver side and fill the last 10 gallons or so by hand very slowly and watch the fuel in the filler neck to avoid spilling. Takes a while, but after 4 to 7 hours driving, I'm good with taking the extra time to fill to the top.
If no one is waiting and I feel like a "complete" fill up I sometimes do the same thing. I also use Silverleaf but how do I know what value to enter as a starting point when tank is full? I typically just enter 150 gallons but I know in my heart my full tank likely has less. I don't push it so I normally fill when I'm between half & quarter tank. My interest is mostly in the spirit of just wanting to know what the tank actually holds.
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Old 05-03-2018, 12:41 AM   #24
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My gauge read 4% on a 150 gallon tank. That should be 6 gallons left. I filled it with 132.7 gallons. I've done this twice now so either the usable is about 140 gallons or my gauge is conservative. FYI my generator worked the entire time.
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Old 05-03-2018, 04:14 AM   #25
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These tanks are a square boxes with no sump for the pickup line. My question is how much will slosh to the opposite side of the tank do you get when you are running up hill. I've run my tank down to the red light area when on the flats... going up a hill at the wrong time? Well, I ve heard people running out of fuel going up hill. I haven't taken the time to do the geometry to figure what grade hill at what tank level will get me in trouble. I just fill up and generally at about the 150 mile empty point, about a 3rd empty.

I miss the round saddle tanks with 4 inch monster fill ports and the curved bottoms, you could squeeze more fuel out of a tank. Just don't miss the roar of the FRED.
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