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Old 07-28-2006, 04:41 PM   #1
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I am thinking about trading motorhomes. What would be the difference in milage between gas and diesel on a 37' footer. Not worried about price just how for you can go on a tank of fuel. 330 cummings engine.
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Old 07-28-2006, 04:41 PM   #2
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I am thinking about trading motorhomes. What would be the difference in milage between gas and diesel on a 37' footer. Not worried about price just how for you can go on a tank of fuel. 330 cummings engine.
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Old 07-28-2006, 05:07 PM   #3
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Could be about the same, went to rally in Tenn was getting on two fillups going down 6.1& 6.7 mpg. While there had ECM reprogramed by Brazels and on return trip home got 9.1& 8.7. The trans was alot smoother less shifting on grades in overdrive and just a pleasure to drive.
I have yet to put on the new CAI, Taylor cables and spark plugs.
Will be watching the mpg on a couple of trips coming up.
Mileage was done with gals into miles not off display.
You have a 30' coach you should get better mileage than I with a 37' coach.
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Old 07-28-2006, 07:40 PM   #4
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I do not know what MPG gas coaches get. I can tell you my signature coach gets a solid 7.4 MPG average over 12K miles. Street weight of the coach is 29K and I tow toads around 5K.
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Old 07-29-2006, 05:06 AM   #5
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arwilda
If price does not matter why have a concern about fuel cost ?
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Old 07-29-2006, 06:07 AM   #6
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My first rig was a 36' gas - Chevy 454 on a P30 chassis - weighing in at about 17,000 lbs. (1997 Four Winds Infinity Class A) My average mileage was about 7mpg at 64 mph.

My 1998 Dutch Star diesel is 38' and weighs about 10,000 lbs more. It is powered by a C8.3 300 HP Cummins mechanical engine with an MD3060 6 speed Allison Transmission. I average about 8.5 mpg at 63 - 64 mph. I believe that if I drop down to 60 mph I'll raise mpg to 9+.
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Old 07-29-2006, 06:28 AM   #7
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I am not worried about the cost of fuel. I want to know how for I can go on a tank of fuel.<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Ed Gardiser:
arwilda
If price does not matter why have a concern about fuel cost ?
Ed Gardiser
Escondido,Ca.
04 Vectra
87 Nissan PickUp
FMCA
</div></BLOCKQUOTE>
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Old 07-29-2006, 07:01 AM   #8
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Fuel mileage is an interesting subject but as you will note from the following we can justify almost anything, but we enjoy our motorhome and will not give it up. I calcuated my gas comsumption per day for our travel as follows:
Motor Home: 55 mph x 6 hrs = 330 miles
330 miles @ 7 mpg = 48 gals.
48 gals x $3 per gal = $144.00 daily
Our car: 330 miles @ 25 mpg = 13 gals.
13 gals x $3 = $39.00 daily
Net cost to drive motor home:$144-$39=$105 daily

Now if you drive your car on a trip you have to pay for gas in your car, you also have to stay at a hotel ($60+), eat two meals per day
(figuring $12 per meal x 2 people x 2 = $48). We eat healthier when traveling in our motor home, we sleep in our own bed, we aren't packed in a concrete surrounded motel, and we meet people when at campgrounds. I know, the cost of gas will probably increase but hotel cost have and will continue to increase along with all aspects of traveling. Granted, traveling long distances in our motorhome will probably add a couple of days to our travels but I rushed through the first half of my life and I'm going to take it easy the second half of my life and enjoy traveling. Now, see how I justified our motorhome!!!! We love traveling in our motorhome.

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Old 07-29-2006, 07:03 AM   #9
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My DP has a 100 gallon tank. The lowest I've ever let it get was to 1/8 full. However, when I refueled I was surprised that the tank took only about 65 gallons.

This might in part be due to the fact that the fuel line for the engine does not reach the bottom of the tank. The fuel line for the generator is set higher.
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Old 07-29-2006, 07:29 AM   #10
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Hi Lew,
I have stopped trying to estimate the gallons I will put into the tank. We both have 100 gallon tanks. If the coach is setting just a little off level (maybe just enough to notice) and I am pumping from the lower side, there is a noticable difference in the gallons pumped.

I did an experiment on this at a fuel stop where I could pump from either side of the coach. The coach was out of level side to side. I could tell by the bubble levels I have in the cockpit. Looking at the coach I could just barely see the out of level. Front to rear showed level. I pumped from the low side (driver's side). Then I went to the satellite pump on the curb side and pumped 9 more gallons! I let both nozzles shut off automatically. I don't even take my fuel mileage unless I am using 4 or 5 tanks of fuel. I record it, I just don't do the math. There is toom much variation on one tank to the next.
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Old 07-29-2006, 07:39 AM   #11
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If you drive at aprox 60 mph and get aprox 6 to 7 mpg and you have a 100 gallon tank,which I would only let get down to 1/4 tank before refilling.I would say every 500 miles between fuel stops.
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Old 07-29-2006, 11:38 AM   #12
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Don't know about you, but we get uneasy when our gauge shows less than 1/2 full. So we plan our trips to fill up at a good truck stop around that premise.

It may seem silly, and we have to admit it is, but we just like the feeling of knowing there is 50 ga1lons of fuel in the tank at all times if we do need it.

Our 45-50 gallons of fuel(the top half of the tank) gives us a 400 mile range and at our speed that is about 8 hours driving time. It fits us just fine. Your situation may be different.
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Old 07-29-2006, 01:30 PM   #13
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arwilda, welcome. i cannot speak for the diesel folks, but my 30' V-10 gets 7.6 mpg with the CJ7 in tow and that yields 500 miles between fill-ups.
that is with a 75 gal. tank
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Old 07-29-2006, 02:10 PM   #14
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Our Workhorse motorhome gets mileage in the 8.1 to 8.3 range and we can travel as much as 550 miles or more in a day. We tow a Saturn Vue and run the dash A/C. We have a 75 gallon tank.
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