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Old 05-23-2010, 08:21 PM   #57
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Pusherman maybe you can help me with resetting my trip computer, if you k ow how to do it since yous also have a c7 I'm assuming you have one, thanks Joe.
Only the 'newer' FL computers are resettable, those with the joystick control. If you have this control, it's pretty easy to reset your mpg computer.

The older computers (pre-2006) are not resettable for mpg.
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Old 05-23-2010, 09:00 PM   #58
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Originally Posted by Pusherman View Post
Only the 'newer' FL computers are resettable, those with the joystick control. If you have this control, it's pretty easy to reset your mpg computer.

The older computers (pre-2006) are not resettable for mpg.
On my '08 I can't seem to reset the MPG. It gives me a message (not exact wording) that it is not allowed. I did a post on a different forum and found another person with the same coach as mine, with the same problem. They went on to say that they can't change much of anything. I attempted to "learn it" in a campground, but with the coach leveled and on shore power I had all kinds of warning buzzers and bells going off, so I quit. I guess that I'll have to attempt another learning experience while at the storage lot instead of the campground. I think that display and control could have been made a lot more intuitive. Joe
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Old 05-23-2010, 09:09 PM   #59
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Originally Posted by Pusherman View Post
Only the 'newer' FL computers are resettable, those with the joystick control. If you have this control, it's pretty easy to reset your mpg computer.

The older computers (pre-2006) are not resettable for mpg.
I tought that does units coudn't be reset I have tryed about a million times and no success, but thanks a lot for the answer, at least now I won't waste any more time trying, Joe.
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Old 05-23-2010, 09:21 PM   #60
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Ok, just go back from florida to new jersey and I drove on cruise control about 63 65mph and the number that I came up with was 8.2mpg and that is a real number with number of galons and miles and a calculator.
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Old 05-23-2010, 09:23 PM   #61
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Cummins ISL400hp in 40'DP towing Ford Explorer I've averaged 7.4 mpg at around 63 mph over 29000 miles.
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Old 05-26-2010, 06:20 PM   #62
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I get between 9 and 10 hyways elevation and my wifes erge to carry everything we own with her. I run abt 63/65 max
8.3 cummins 295 hp 6 spd allison 36 sport coach ( not very heavy)
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Old 05-26-2010, 07:09 PM   #63
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According to Caterpillar https://ohe.cat.com/cda/files/287140/7/LEGT5364.pdf your 50K lb coach needs about 125hp to run at 55 mph, needs 215hp to run at 70 mph. Air resistance alone takes 62hp at 55 mph, takes 127hp at 70 mph.

I can't understand how running at 55 mph vs 70 mph nearly doubles your fuel consumption

My result with my 25K coach and 3500lb toad is very much in line with the Cat doc guidelines. Once I get in to 6th gear at 53 mph, any increase in speed increases my fuel consumption. If I run in 5th at 50 mph then fuel consumption slightly suffers.


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Originally Posted by cb5300 View Post
If you want the best MPG, then you need to find the "sweet spot" with your motor. I have a Cummins ISX 600HP and the coach weighs in around the 50K neighborhood. 1600 RPM is the sweet spot for my coach and this works out to be 69-70 MPH. This will give me around 6.5 to 7.5 mpg flat towing a Ford Explorer, and the coach (Monaco Signature) has 20,000 miles on it. I've try the 55 MPH thing, and at that I will get only 4.0 mpg.

I've had my coach on Cummin's dyno here in Cloverdale and their numbers back up my findings...I was also happy to find out that my motor was actually turning out 700 hp right out of the box.

By the way, my findings are based on cross country trips from Virginia to Yellowstone and to all states in between...
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Old 05-27-2010, 08:02 PM   #64
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Ok, just go back from florida to new jersey and I drove on cruise control about 63 65mph and the number that I came up with was 8.2mpg and that is a real number with number of galons and miles and a calculator.
That is a real number for the trip if:

When you filled the tank it filled consistently to the same level from start to final fill.

I have one regular fueling stop in my 7 year average that always allows me to add more gallons on any fill. That ending gallons number nearly always results in the lowest mpg per tank that I get. The pad is level in four directions, it has no rapid fill like a truck stop pump, and I fill from only one side of the MH.

My 7 year cumulative average is 7.23 MPG but I have had highs of 9.0 and lows of 5.6 MPG due to all kinds of factors.

I track the mileage mainly to try to spot mechanical problems.

Since most of my driving is in the West, the concept of Barometric Altitude effects on fuel mileage gives me some newly found comfort.
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Old 05-27-2010, 09:32 PM   #65
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My 7 year cumulative average is 7.23 MPG but I have had highs of 9.0 and lows of 5.6 MPG due to all kinds of factors.
And THAT is the real key to meaningful MPG claims - a "one-time-best" result that was done downhill with a tailwind might be great for bragging rights - but totally meaningless for true accuracy!

I like to make reference to MY best towing MPG pulling out 5er - 17+ mpg in mixed driving - but I don't talk NEARLY as much about the 13 MPG towing in the California Sierra...
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Old 06-14-2010, 06:35 PM   #66
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I have kept every fuel fill receipt since our '08 Monaco Dynasty was new (3 yrs.). We have ranged anywhere from 4.5 to 9.5 but usually average about 7.5 with our 8.9 Cummins 425hp ISL pulling an '07 Honda CR-V (3,400 lbs).

I try to keep the speed at about 55-58 mph. I really don't know the sweet spot but I feel comfortable traveling at that speed. Most of the time, cars/trucks pulling a towed are limited to 55 mph (in California).

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Old 06-14-2010, 07:04 PM   #67
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According to Caterpillar https://ohe.cat.com/cda/files/287140/7/LEGT5364.pdf your 50K lb coach needs about 125hp to run at 55 mph, needs 215hp to run at 70 mph. Air resistance alone takes 62hp at 55 mph, takes 127hp at 70 mph.

I can't understand how running at 55 mph vs 70 mph nearly doubles your fuel consumption

My result with my 25K coach and 3500lb toad is very much in line with the Cat doc guidelines. Once I get in to 6th gear at 53 mph, any increase in speed increases my fuel consumption. If I run in 5th at 50 mph then fuel consumption slightly suffers.
Let me add a note to hopefully balance the discussion of fuel economies on this particular post. When you try to compare the "sweet spot" of a MH less than 500 hp to those at or greater than 500 hp we all must remember the torque and rpm difference. To run a big block 500+ hp diesel at 1300 rpm, you will be lugging the engine. That's why cb5300 can get the fuel economy out of 600 hp traveling at 69-70 mph. My brother has a 300 hp 40' and gets 1 mpg better than I do with 500 hp as he follows me at 65-68 mph. When we slow to 60 mph he gets 2.5 mpg more than I do.

For what it's worth.

Dave
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