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Old 06-22-2015, 01:46 PM   #1
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450hp M11 mileage and Signature fuel tank capacity

Hi there,

Just got back from an almost 2500 mile road trip to SoCal to trade in the old Beaver and pick up the 98 Signature. Well, we made it so +1 to that. Anyway, I know the official capacity is 200gal, but what's the realistic capacity? All things being equal the dealership filled the tank in Cali and we drove 1100 miles and it took only 110g to refill..... That was adding fuel with the gauge at just under 1/4 and the "low fuel" light flickering on corners..

So did I get about 10mpg at 65 on I-5 or what? I went down pulling hills at 38-40mph and came back pulling at 51-53. That's nice power right there. And the drive quality on the S chassis is waaaaay better and much more
solid.

What say you?

Allen
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Old 06-22-2015, 02:15 PM   #2
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My first question would be was it a real fill up, or did they stop when the foam hit the fill. I know its a pain, but the only way to get a true fuel mileage, is to fill until the foam is gone for a few tanks.
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Old 06-22-2015, 03:17 PM   #3
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Are you sure it has a 200 gallon capacity. I looked in a 2000 model year and they list 150 gallon for fuel.

I have 128 gal tank. I was running the generator on a low tank and lost fuel, drove to the filling station consuming another couple of gallons. I put in 100 gallons, which would be 1/4 tank when I started.

I suggest that you measure the tank & calculate the volume.
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Old 06-22-2015, 03:49 PM   #4
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Talking

According to the 1998 Signature brochure I found at guaranteeRV (a Canadian dealer with a lot of archived brochures for various brands!) the usable fuel capacity is listed at 200 gallons. That's my basis for my capacity. Also we had the salesman fill it past the shutoff by quite a bit (I'm a diesel mechanic who drives diesels if it matters). And after 1100 miles when I refilled I also filled clear to the neck.

I'm wondering about others experiences with similar coaches. After 2000 they are different on fuel capacity. Up to that year break they had ran 200g tanks for quite awhile on their big models.

Allen
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Old 06-22-2015, 04:41 PM   #5
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Quote:
Originally Posted by dieselbeaver View Post
Hi there,

Just got back from an almost 2500 mile road trip to SoCal to trade in the old Beaver and pick up the 98 Signature. Well, we made it so +1 to that. Anyway, I know the official capacity is 200gal, but what's the realistic capacity? All things being equal the dealership filled the tank in Cali and we drove 1100 miles and it took only 110g to refill..... That was adding fuel with the gauge at just under 1/4 and the "low fuel" light flickering on corners..

So did I get about 10mpg at 65 on I-5 or what? I went down pulling hills at 38-40mph and came back pulling at 51-53. That's nice power right there. And the drive quality on the S chassis is waaaaay better and much more
solid.

What say you?

Allen
Congrats on your new Coach... it's a nice one! I don't have my owner's manual in front of me but IIRC some literature back then listed a 200 gallon tank which was later revised to 150. In 15+years of ownership and many miles traveled, the most I've ever pumped was 130 gallons.

We just finished a 1500 mile leg flat towing a Jeep TJ in the northern New Mexico mountains to central Texas. Mostly 2 lane, some interstate, cruise set @ 70mph. Ran the generator 24hrs while driving, camped for 8 days, used the aquahot, and got 5.89 mpg, hand calculated. I have never gotten 10 mpg but then again I don't drive 65mph. I have reams of records but off the top of my head I'd say my lifetime mpg is between 5.5-7.5mpg depending on the applicable variables; load, speed, terrain, trailer weight, etc. For comparison, my son (2000 40' Sig Admiral) made a 4 day trip to south Texas last week (800 miles) flat towing a CC GMC 3500 Duramax 4x4 and averaged 6.3mpg, hand calculated. This is also consistent with the other 2 Sig's of the same era that we often travel with

With the gauge indicating 1/4 tank it takes 103-108 gallons to fill up to the neck. My generator runs out of fuel at roughly the same mark on the gauge. FWIW my son's repeats the above numbers with the exception that his genny doesn't run out of fuel as early.

In my opinion these are fine coaches... excellent power, handling, ride quality and construction. I hope you enjoy yours as much as we have ours! Have fun, be safe, and enjoy your travels.

-David
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Old 06-22-2015, 04:44 PM   #6
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My Sig has 150 gallon tank but states that it is 140 gallons usable because of required vent area at the top of the tank and that the filler pipes prevent me from filling it to the top. I have used the air suspension and tilted the Sig and could get more fuel in it but it is not really worth doing it. I wouldn't be surprised if you got close to 19 mpg on a pre EGR motor. Were you towing anything? I am at 44,000 lbs and that what kills my gas mileage. I bet you are lighter than that.
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Old 06-22-2015, 07:26 PM   #7
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I just got back from an 1800 mile trip from No. CA across NV to So. UT and down to Vegas and back to No.CA. I averaged 8.3mpg pulling my enclosed bike trailer. I pulled a LOT of mountain passes and kept it around 63mph most of the way. Except when the speed limit was 80 then I stepped it up to around 68. Don't like going faster as the mpg goes way down exponentially as you increase the speed. And I have the same coach. Your mileage may vary but I assume you should get the same under the same conditions. And I also have a 200 gl tank but never let it get down to 1/4
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Old 06-22-2015, 08:19 PM   #8
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My 99 Executive shows 200 in the brochure - I can tell you for a fact it is 178 usable.... My M11 generally gets between 7.5 and 8.5 depending on what I am towing, how fast I'm driving and what the terrain and wind conditions are. normally towing a 28' enclosed trailer.
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Old 06-23-2015, 05:44 PM   #9
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Thanks for all the responses. I am going on several long trips this summer so I can be sure the top off point is the same and then I should get a better point of reference. I'd think 10 isn't out of the question given perfect conditions.

On my trips I will be hauling a 25' enclosed trailer at about 9k lbs. I'd say 7.5 then would not be impossible. I do so many short coast or mountain trips that I know I get horrible mileage then, but mostly they are 3 hour trips max.

Again, thanks for the replies.

Allen
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