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fuel milage question 7 years 8 months ago #12095

  • Hank85713
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we are planning on getting a Class B+ (Class C-) and wife asked question on fuel milage. I told her 8-10, she asked about a class A, I told her probably same or less since they use same running gear (V-10, auto) and weigh more. A friend has a DP and said they get 12. We dont want anything over 30 ft so diesels are not generally available in that size.

So just need to know what folks are really getting in these things, we get about 12 with our F350 w/TT but its a small one. Looked at a Cl B+ with the same engine as out f350 and it performance was underwhelming, so looks to be the gasser in the future.

Thanks HAnk

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fuel milage question 7 years 7 months ago #12109

  • ErnieT
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Just got rid of a 30 foot gas class C. Got 7 miles to gallon. Now have a 35 foot class A gas and get 7 miles to a gallon.
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fuel milage question 7 years 7 months ago #12110

  • Hank85713
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Thanks, found a post on another site where a guy gave readouts of his trip. Lowest around 7, best 10.5, avg about 8.5!

Going to look at a diesel rig again tomorrow, another poster said he was getting around 11 in a similar rig. Just got to check it out, owner is asking way too much so will see how much give there is to get it if its in good shape.

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fuel milage question 7 years 7 months ago #12112

  • monkey44
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There was a time when diesel fuel was less than gas, and got better mileage. Now, diesel fuel is more than gas and still gets better mileage. What I don't understand is why spend so much extra for a diesel engine and still pay more for fuel. We can buy a lot, a very lot, of gas for the difference between a gas and diesel engine in the same RV.

I'm guessing around $5000+ or more for a diesel in a truck, and am not sure how much more in an RV, but am betting more than that ... and that's a lot of gas even at 10mpg or so. And the maintenance is higher as well.

So the difference in a few mpg takes a long time to break even, particularly when the price of diesel fuel is now higher than gas. Color me puzzled?

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Last edit: by monkey44.

fuel milage question 7 years 7 months ago #12128

  • skyking8
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Diesel = torque, long term reliability, never needs a tune-up, better fuel mileage (offset by the cost). In a DP motor home the noise is in the back.

I have a 37' MH with Cummings 250HP diesel which was a recent downsizing from a 40' 330HP Cat. One would think my fuel mileage would have been better, but not so. 8 mpg with tow and 9 without...on flat ground.

Monkey44> Have you taken a car to the shop lately? Mechanics are not cheap whether working on diesel or gasoline engines. :)

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fuel milage question 7 years 7 months ago #12130

  • stanbnv
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I don't know about MHs but my 2006 Ram 3500 CTD 6 speed manual gets @20 mpg empty and 11 mpg pulling my 32 foot Laredo, depending on my right foot. My old Ford F250 w/460 cid Gasser 5 speed manual, got 8.5 pulling and 11 empty. I hear that the 2007.5 and newer diesels do get less milage than the older ones. Price of diesel is a touchy subject for me. Here in NV, last spring when we came back fron Mexico it was an few cents less than regular gas per gallon, now it's 20 cents higher. The price in Mexico is about the same as their regular and is a bit less than US prices.

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fuel milage question 7 years 7 months ago #12131

  • monkey44
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I understand, benefits to both engines - cost vs power, etc. But, for my wallet, it takes a lot of fuel and tune-ups to account for $5000 or $6000 difference in cost.

So, I'm guessing the major benefit to diesel is the power rather than 'money' - and if you need the power because you have a heavy RV, then you need it. The claim the diesel "cost less" makes no sense.

I've never owned a diesel, so have no reference personally. But I keep reading that the cost is less because it gets great mileage - and that seems inaccurate to me. And tune-ups are only a couple hundred bucks every 100,000 miles or so, less if you do it yourself.

The noise and odor of a diesel turns me off - no matter the power too.

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fuel milage question 7 years 7 months ago #12132

  • johnandmari
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Oh my, another question regarding gas/fuel mileage. MPG is so very subjective; speed and weight of vehicle, weather (hot/cold, windy or calm, if windy which way is the wind blowing, dry/humid), even the engine size/HP will affect the MPG. Also, calculating MPG based on a single tank of fuel will not accurately establish a true MPG figure – the same person driving, the same vehicle, down the same road will get two different MPG figures. The only way to come close to an accurate MPG figure is to track all fuel consumption over time.
I have tracked our fuel consumption since purchasing our 2003, 40 foot diesel pusher – Cummins 350 HP ISC 8.3; loaded and towing we weigh close to 35,000 down the road. My MPG after 75764 miles is 8.95 MPG. During the engine break-in period, I had a low MPG of 5.6 MPG for one tank – the highest achieved was two years ago at 10.9 MPG. The MPG for a trip just completed – round trip from Colorado to South Florida for a family emergency was 9.33 MPG.

John
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fuel milage question 7 years 7 months ago #12133

  • LamSan
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Super response John and Marie and we do not track our fuel consumption since our coach is a 45' Tiffin Zephyr with a 500HP Cummins and we tow a big SUV. Do we get more than 7 MPG, nope but Lambert loves driving this RV and what little maintenance is required he takes care of it and we have had it for 6 years now and it performs like a champion no matter what elevation or condition we are in. Previously had a 38' Phaeton with a 330 CAT and got anywhere from 7 to 9 depending on all condtions mentioned by John and Marie.
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