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Old 06-23-2007, 11:20 AM   #1
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Had a 2000 40fds and now have a 2004 fdts. Both coachs would only get between 7.8 and 8.3 MPG. We left AZ last April until Nov., traveled up into Canada and back and averaged 9.2. We left Puerto Penasco, Mexico,went to Phoenix and on to Blythe and got 10.2. We left Blythe and went to Lodi and got 10.7 MPG. Now in Eugene and got 9.4. No, we didn't have a constant tail wind. I use the economy button, accelerate moderately, and the minute I hear the trans shift into 6th gear, (56 MPH in my coach) I put it in cruise control. I cannot believe the difference in MPG. We ARE retired, aren't we. I used to travel at 62 to 65. You really don't lose that much in a 4 hour day, besides, you get a better look at the scenery!! Roy
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Old 06-23-2007, 11:20 AM   #2
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Had a 2000 40fds and now have a 2004 fdts. Both coachs would only get between 7.8 and 8.3 MPG. We left AZ last April until Nov., traveled up into Canada and back and averaged 9.2. We left Puerto Penasco, Mexico,went to Phoenix and on to Blythe and got 10.2. We left Blythe and went to Lodi and got 10.7 MPG. Now in Eugene and got 9.4. No, we didn't have a constant tail wind. I use the economy button, accelerate moderately, and the minute I hear the trans shift into 6th gear, (56 MPH in my coach) I put it in cruise control. I cannot believe the difference in MPG. We ARE retired, aren't we. I used to travel at 62 to 65. You really don't lose that much in a 4 hour day, besides, you get a better look at the scenery!! Roy
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Old 06-23-2007, 06:18 PM   #3
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Good job Royboy:
I think the mountain traveling to get to Eugene cost you some mileage. Sounds like your mileage is really good. We have an 03fdts pulling an SUV and get 8.5 mpg. Thats the best we have ever got.
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Old 06-24-2007, 02:44 AM   #4
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RobBoy, I think all your mileage is terrific. I am always thrilled when I get 7.5. Of course I don't have enough sense to stop traveling at 70-75.
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Old 06-24-2007, 03:14 AM   #5
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Royboy,

I noticed there is no mention of a Toad and I assume you don't have one, correct?
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Old 06-24-2007, 01:48 PM   #6
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I pull a 2000 jeep grand cherokee, about 4000 lbs. We gross 31,300. Remember, let the cruise do the driving!
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Old 06-25-2007, 02:30 AM   #7
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Royboy,

You're pulling a big Toad and getting that mileage while doing it?

How good is that?

I assume you have the 350 ISC?
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Old 06-25-2007, 07:08 AM   #8
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We pull Pontiac Bonneville on a dolly and we seem to be getting about 9 1/2 mpg on an average. At times over 10 mpg. We stay between 55 and 60 mph and we don't use the economy feature on shift console. I don't think the weight of the car and dolly changes fuel mileage numbers much unless towing in the mountains.

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Old 06-25-2007, 07:28 AM   #9
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That is excellent mileage. We have a person in our So Cal Alpine Club, that had his engine data downloaded by Cummings and I believe he had 9.5 lifetime . IIRC.

I use the VMSpc. On our last trip to St. Louis, I drove for 8.0 mpg. We were averaging 9.2 traveling around 60-62 on cruise and economy mode. But the last leg of our trip to St. Louis, I drove 70-75 (speed limit 70 and 75)on the interstate. We were of course anxious to see our daughter . By the time we arrived we were down to 8.3.

On our trip back we drove Colorado two lane mountain roads, Utah 2 lane, and Arizona 2 lane. We averaged 7.9 for 4200 miles. We were happy with that. But would love to see 10 just once .

Not retired yet, and the last day is always the fastest
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Old 06-25-2007, 03:03 PM   #10
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Thanks.
All good info and now I know what to look for.
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Old 06-25-2007, 06:41 PM   #11
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Bob,

In May we took a two-week 1377 mile trip to Lake Shasta CA and the Southern Oregon coast. This entailed 2 trips over Siskou pass and 2 trips over the Oregon coast range. Driving mostly at 60 to 62 MPH, I averaged 8.77 MPG with the CRV in tow. The first portion of the trip From Olympia to Ashland Or. (about 450 miles) I got about 9.5 MPG. I figured this the old fashioned way, miles traveled devided by gallons needed to fill up. BTW, mine is the 325 horse engine. Hope this helps.
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Old 06-25-2007, 08:48 PM   #12
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Figured I might as well share our fuel mileage data for the benefit of others as well. I track every fillup with every gallon and every $ spent on an Excel spreadsheet. On our 2006 36 MDDS with 400 Cummins, trying to average around 60-62 mpg when driving the freeway, we have averaged 7.65 mpg over our 17,554 miles of driving thus far since purchase last summer, including generator use. If I allow 0.5 gallon/hour for the generator, the driving portion would be 7.81 mpg. The Silverleaf monitor says 8.0 mpg since new.

Our worst tank for a trip with at least 300 miles on it was 6.67 mpg and our best, again with at least 300 miles, has been 9.0 mpg. Our last trip, 1800 miles from western WA to central MT, earlier in June averaged 7.4 mpg over all the passes and altitudes.

Our 2006 4Runner toad weighs about 4400 lbs loaded and it's behind the coach nearly all the time; the coach weight is usually just under 30,000 lbs.

Nearly all our driving is in the west, with some side trips to Texas, so perhaps the more mountainous driving is affecting our mileage a little more than others.

Incidentally, our previous motorhome, a 2005 32' Fleetwood class C with a Ford gas V10, 5-speed auto, and Banks powerpack, weighing 14,500 lbs towing the same 4Runner averaged 7.4 mpg over our 28,000 miles and 1 1/2 years of ownership.

My data says that if you own a newer gas or diesel motorhome and tow a reasonable size toad, at 60 mph, 7.5 to 8.0 mpg is what you'll get over the long haul. I have some friends with 2005 and 2006 Class A Workhorse gas motorhomes and they average 7.5 mpg as well.

So when people ask me fuel mileage, I just say 7.5 to 8.0 mpg.
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Old 06-26-2007, 02:36 AM   #13
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Thanks again.

When I set up my spreadsheet, I plugged in 8 MPG barefoot and 7 MPG with a Toad. As we also have a Navigator getting a consistent 18.5 MPG, I used it for the Baseline 'comparison'.

As it turns out, the mileage others have achieved gives me a bit of hope we can do better than what I considered when towing our Taurus on a Dolly.

Time (and miles) will tell.

Regardless, for what it's worth, operating an RV is actually a comparatively less expensive way to travel. In fact, AARP reports it as 1/3 the cost of airfare, lodging and car rental.

Now, don't you feel better knowing that, as an RV owner, you are really "Economizing" by "Maximizing" your travel dollar?

The added benfit is in the meeting of some wonderful people.

Another question/topic:
Is it worth a new thread to discuss "Fluid Analysis" of Lube, Trans and Hydraulic oils?
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Old 06-26-2007, 05:54 AM   #14
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Along with "Fluid Analysis" I am wondering if anyone has noticed a difference in mileage since the introduction of the Ultra Low Sulfur Diesel?
I think, at least in Washington State, that we started seeing the ULSD in September/October in some stations.
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