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Old 01-14-2013, 10:32 AM   #1
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Another Gas vrs DP

This is my first post so bear with me.

I have read multiple post in this and other sites discussing gas vrs dp. I have a 2005 GMC duramax with allison transmission. Several years ago I got a tank of bad diesel fuel from Flying J. Almost $10k to get it fixed. In nov last year we got another bad load at "city gas and liquor" mom and pop station in Winnebago, NV. (If I knew what the name was we wouldn't have gotten fuel there). We were with another couple that also got bad fuel at the same time. Fuel was verified by Nev division of measurement standards and also from a private forensics lab. Both tests showed that the fuel is bad. To fix the problems we spent almost $6k and our friends with a 2003 Dodge Cummins spent almost $16k!!! Luckily both of our vehicle insurances (comprehensive) covered most of the costss. Needless to say we will only go to name brand stations from now on.

We are looking at new and used Class A's in the 34-38' range. The point is that I am leary of diesel for some reason. I like the DP's but because of past issues we are also looking at gas. The cost of buying either is certainly something we need to consider. When we travel (snowbird and camping) I wonder what the real MPG is for gas. This seems to vary quite a bit and what is real and what is exaggerated. 6-8 is acceptable, but lower is not. Any thoughts? Thanks

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Old 01-14-2013, 10:43 AM   #2
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6-8 is par-for-the-course with a gas rv, and I averaged 8.5 with our Tioga class C. Later, my 32' Jamboree got 11- I was very happy with it. I am getting almost 9 with my 35' class A now.

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Old 01-14-2013, 10:49 AM   #3
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Sorry to hear of your problems with diesel. I still like diesel and try to top off at a name brand station on the way as this will hopefully lessen the likely hood of bad fuel. We always leave town with a full tank of diesel. I can only offer what I have heard as far gas goes. I fellow co-worker has a class c MH powered by a Triton V10. He was getting about 6-8 miles per gallon. After installing a banks system he is now claiming about 10 miles per gallon. A diesel will always give a better mpg due to being more efficent. Again as I have said before it is a personnal choice and it was more experience and knowledge that drove me to purchase a diesel MH.

Martin Picke'
1998 Rexhall Anthem 34' DP, Cummins ISB, Allison 5 speed, Spartan Chassis, 300 watts solar.
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Old 01-14-2013, 10:51 AM   #4
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Have had both gas and diesel... NOT a one size fits all kinda decission !

If you travel extensively the overall cost of fuel with a Dzl will be lower than that of a comparable gas powered MH. The Dzl will cost more for maintenance and oil changes and getting or finding diesel fuel can sometimes be a bit of a chore. On the otherhand, no comparrison in ride comfort or stability gas vs diesel.

If you do a lot of backroad travels and out in the boonies kinda stuff the gas MH may prove more acceptable but for over the road and fulltiming IMHO nothing beats a diesel MH for comfortable ride, lower fuel costs, and stability.

DW and I are currently about to make the switch to the Diesel MH from my "trainer Gas MH" and I look forward to operating it.

We have consistently averaged 7.1 mpg in the mountains and up to 9.0 mpg on the flatlands in the gas MH powered by GM 8.1 Vortec beast, towing a Honda Accord with a tow dolly. I seldom drive over 62 mph opting to enjoy the trip rather than impress the teens with my raw power and acceleration and sheer stupidity ! Those we have talked with extensively do not fare quite as well with the Ford V-10's in the mpg department but the Ford has taken over the gas MH market and may be easier to find repairs for down the road.

Your MH purchase does not have to be a forever obligation... try the gas and see if it fits your needs... our's did for couple years but now we are about to hit it fulltime and that diesel mileage is quite attractive as well as the quieter and more stable ride quality.

Best of luck, stay safe and Thank a Vet for your freedoms !
05 Itasca Suncruiser, Stock w/ScanGuage II,
2012 Honda Accord TOAD,Home Based in Spring Hill, Florida...Retired Navy Officer
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Old 01-14-2013, 10:54 AM   #5
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We average 7.5 to 8 mpg towing our PT and I generally travel 62 to 65 mph. Our moho is 37' and is probably the "heaviest" gas motorhome on the road. The 8.1 does a great job linked with the Allison transmission. I have never yet felt lacking in power. The DP may ride a bit better but I have NO complaints at all with the comfort of ours. Point also being when we're all sitting still we are all generally equal in the ammentities we have on board. JMHO Good luck shopping and hope you find the coach that best serves your needs.
Steve & Sally / HiTee & Hudson Our Little Poms / Heidi & Houston Forever in our Hearts
04 NEWMAR MACA 3778 W22 / 05 PT Vert
Michigan (Summer) Florida (Winter)
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Old 01-14-2013, 10:56 AM   #6
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Originally Posted by MegaRoadie View Post
DW and I are currently about to make the switch to the Diesel MH from my "trainer Gas MH" and I look forward to operating it....
LOVE IT...Sandee and I just did the same thing. Never thought of that phrase to 'splain it.

Lots of good advice too.
Don, Sandee & GSD Zeus. Gardian Wings earned are GSDs Gunny (7/11/15) & Thor (5/5/15)
2006 DSDP 4320, Spartan MM IFS, 2013 CR-V, Blue Ox Avail, SMI AF1, Samsung 197R Refer.
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Old 01-14-2013, 11:02 AM   #7
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The responses to the gas v diesel question can be endless. Each has their advantages and disadvantages. I think if you are driving lots of miles each year there is a distinct advantage to the diesel. Currently diesel fuel is substantially more expensive per gallon than gas. The mileage difference would need to be significant to make up for the difference. However, if you are doing a lot of mountain driving the dp will have far more torque than a gas engine.

Last spring we traded our 1998 32' Brave up to a 2007 36' Voyage (both winnebago products). The new to us Voyage is on a W22 workhorse chassis with 8.1 GM engine and 6 speed Allison transmission. The improvement in ride and handling for our newer coach is head and shoulders above the older Brave. We generally drive the interstates between 60 and 65 mph and are realizing between 7 and 9 mpg. On a good level road with a bit of tailwind we sometimes do better, but not often.

I think that expecting 7-9 MPG on a gas powered motorhome is realistic. These are not fuel efficient machines, either gas or diesel.
Tom and Barb
'07 Winnebago Voyage 35L
Workhorse W22 chassis FMCA 219315
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Old 01-14-2013, 11:49 AM   #8
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You can get a tank of bad gas too. I got a tank in an old pick-up that had red soil in the tank after filling-up at an independent station in the Sierra's.

Like was said, the gas vs. DP question is one for each individual to make...you have to be a smart shopper for cost, maint., and floorplan too.

We have a gas W24 (8.1L, Allison 6spd) in our 37' Damon and get an average since owning it of just over 8MPG (average of all tanks used). These number go up and down depending on the route (in east Texas I got over 9 but in the mountains of CA and OR it was 6).
Kim and Steve, Mustang LCDR (Ret), '07 Damon Outlaw #1193
I have seen gross intolerance shown in support of tolerance, Samuel Coleridge
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Old 01-14-2013, 01:54 PM   #9
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I think you will find DP and Gas of the same size will have about the same MPG. If you are going to travel alot, most DP will give you a better ride and less noise and heat up front. If you are going to go from home to point A and stay for several weeks or months, the gas will be a lot cheaper, purchase price, fuel cost, and maintenence. As someone above said, once parked there isn't any difference. Look at how you plan to use your MH and buy accordingly.
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Old 01-14-2013, 03:31 PM   #10
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Keep in mind how fast you want to go to get anywhere. Here in AZ, if I drive 75 MPH to get to California, I'll get 6 MPG. If I drive 65 MPH, I'll get 8 MPG. I don't know what I get if i drive slower....
'04 Windsor 40PDQ
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Old 01-14-2013, 03:37 PM   #11
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The fuel question and mileage ... How many miles will you drive pre year realisticly? in most cases (do the math) the difference in cost when you consider the depreciation of the coach over the same time is really not important. Ive seen fellow RVers spend thousands on a coach to gain 1-2 MPG but never drive over a few thousand miles a year.. Not smart. But it depends on your driving amount, Its easy to do a comparison on costs once you know that
Re bad diesel step up the places you purchase fuel,!! Diesel goes "bad " and Mom and Pop dont sell enough to keep it fresh with no contaminates . Visit High volume stations, but never while the tank is being filled!( probably the flying hook problem .. stirred up junk )
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Old 01-14-2013, 03:56 PM   #12
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On my 08 SouthWind 32vs, with a V-10 Ford, I base fuel cost at 5 mpg it comes out very close. That is a 4000 mile trip, Texas to North Idaho and back. This is based on several trips. If I get better I win, if not, I'm not surprised. Only you can make the choice, good luck gps
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Old 01-16-2013, 12:09 PM   #13
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Thanks all. I guess we have some deciding to do.
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Old 01-16-2013, 06:19 PM   #14
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I had an older (93) Georgie Boy 32'... loved it, got 7.4 to as high as 9 on ONE fillup going with the wind and downhill most of the way.. lol Our new 2001 Georgie Boy with 2 slide outs 35' got 7.797mpg on her first trip pulling my 1500lb motorcycle & trailer behind me. Love the roominess of the slide outs! I'm very happy with the mileage but remember, I keep it at a very steady 55 to 57 mpg - I believe half the pleasure of the trip is the traveling part!

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