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Old 08-13-2015, 11:39 PM   #15
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1 thing your are using liters not gal ?????
just reread your post it was all in the states right
i live in us not canada
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Old 08-14-2015, 01:02 AM   #16
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another thing may have some effect - a set of new sumitomo tires with exact manufacturer recommended pressures - front 120 psi and rear 110 psi.
Certainly don't mean to knock your great fuel mileage, but to attain the best ride quality and load carrying capacity your tire pressures should be set based on your weights. Preferably four corner weights with the pressures set according to the heaviest position on each axle.

If you're at 120 front and 110 rear, unless you're really packing some weight, I think you might be over inflated and giving up some ride quality.

If you have already weighed your coach and those are the recommended pressures, then never mind my comments and enjoy your great fuel mileage.
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Old 08-14-2015, 06:51 AM   #17
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not bragging, just trying to understand

Sounds about right. We get 8.5 in the mountains towing a full size 6,500 lb. truck, and 10-11 mpg on the flat not towing.


Run at 105 psi. On Michelen XRV's.

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Old 08-14-2015, 07:16 AM   #18
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i knew . actually it was not planned - previously i "gasbuddy"ed another station in mt vernon but talking while driving with dw made me miss the exit i had to continue driving until... thank god i made it
when I would check my mpg which is everytime I fill up, I would always get better mpg when I ran the tank close to empty, then when I would fill up at half a tank, it gives a better average over a longer distance, ie; more driving on flat roads, longer period without headwinds etc.
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Old 08-14-2015, 07:26 AM   #19
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Obviously, it's the lack of headwinds. You're always going north or south so you only have crosswinds from the west.

Obviously, again- it's all uphill going north, but all downhill coming back south so that averages out to flatland. (any map will tell you that North is UP and South is DOWN.)

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Old 08-14-2015, 11:29 AM   #20
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Obviously, it's the lack of headwinds. You're always going north or south so you only have crosswinds from the west.

Obviously, again- it's all uphill going north, but all downhill coming back south so that averages out to flatland. (any map will tell you that North is UP and South is DOWN.)

Nope...it's the exchange rate...cross over into Canada, and you get 1.33 mpg improvement
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Old 08-14-2015, 11:37 AM   #21
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you funny man !!!!
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Old 08-14-2015, 04:28 PM   #22
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When we had our 2005 Diplomat with a 400 ISL, we took a coast to coast trip towing our Silverado 4 door. It was a short/light coach (36' at 32K). We fueled up at the same pump, facing the same direction when we left and when we returned. I did the math for the 6000 miles and we got 9.3mpg.

Without towing, we often saw over 10 mpg. Now with my new coach, I'm lucky to break 8, using the same driving habits.

Here is a factor that many miss when doing the math on single refills. On my Diplomat, the tank was 7' wide and ran side to side. If the coach was just a couple of inches out of level (side to side) my tank would take either 5 more or 5 less gallons depending on which way it was leaning. The tank in my new coach is more boxy and fits between the frame rails. It's not as affected by side to side or front to back slope.
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Old 08-15-2015, 04:57 PM   #23
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CountryFit - Good for you on the good MPG! Your driving speeds probably are the single largest contributor to that MPG.

Not real up on that era Intrigue. Is it the ISC 8.3 or the ISL 8.9? (Don't think they offered CAT's in Intrigue's until a few model years later.

Also not familiar with our tires brand, but if new, good chance their part of the SmartTire program, which is supposed to improve MPG some too. (And the question about the air pressure I'm sure was very well intended. But just too many variables to know if a given PSI is too high or low for a coach tire combo. The size of the tire, the Load Rating for the specific tire, are two key things that can change greatly the recommended PSI setting. To be clear, not knocking that input. As anytime you see a recommendation to get four corner weights and setting the PSI to the Tire Manufacturers recommended PSI for actual weight - I feel is good info to share!)

Our 04 Allure, with tag, and with CAPS era ISL370 (Flashed to 400), gets an average of 7.5-8 MPG over the long haul. The tag adds weight, and or toad is just a bit more heavy then yours, as it is the CRV. So your MPG does not surprise me.

Salute! (And as a good nature ribbing from one CC member to another - sure, you were bragging! But rightfully so...)
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Old 08-15-2015, 09:33 PM   #24
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The biggest change was speed. A reduction in speed increases fuel mileage. If I remember correctly, the power required to drive a vehicle increases with the cube of velocity/speed. For instance, if you are traveling at a rate of 20 MPH and increase your speed to 40 MPH, wind resistance on your vehicle will quadruple.
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Old 08-15-2015, 10:34 PM   #25
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The biggest change was speed. A reduction in speed increases fuel mileage. If I remember correctly, the power required to drive a vehicle increases with the cube of velocity/speed. For instance, if you are traveling at a rate of 20 MPH and increase your speed to 40 MPH, wind resistance on your vehicle will quadruple.
Wind resistance increases with the SQUARE of the velocity. Yes, doubling your speed will quadruple the wind resistance.
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Old 08-16-2015, 09:02 AM   #26
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CountryFit - Good for you on the good MPG! Your driving speeds probably are the single largest contributor to that MPG.

Not real up on that era Intrigue. Is it the ISC 8.3 or the ISL 8.9? (Don't think they offered CAT's in Intrigue's until a few model years later.

Also not familiar with our tires brand, but if new, good chance their part of the SmartTire program, which is supposed to improve MPG some too. (And the question about the air pressure I'm sure was very well intended. But just too many variables to know if a given PSI is too high or low for a coach tire combo. The size of the tire, the Load Rating for the specific tire, are two key things that can change greatly the recommended PSI setting. To be clear, not knocking that input. As anytime you see a recommendation to get four corner weights and setting the PSI to the Tire Manufacturers recommended PSI for actual weight - I feel is good info to share!)

Our 04 Allure, with tag, and with CAPS era ISL370 (Flashed to 400), gets an average of 7.5-8 MPG over the long haul. The tag adds weight, and or toad is just a bit more heavy then yours, as it is the CRV. So your MPG does not surprise me.

Salute! (And as a good nature ribbing from one CC member to another - sure, you were bragging! But rightfully so...)
Smitty
thanks smitty! i always enjoy reading your posts for the thorough thoughts... my engine is isc 8.3, 350 hp - a small engine in today's standard. it does get the job done, in spite of needing ocassionally to lower the gear to climb a long and steep uphill.

tire pressure setting is a tricky thing...too many variables...i wonder how other rvers weigh their rvs - . with full load (for example, fuel 100 gal, fresh water 100 gal, maybe hslf tank of grey and black...)? there will be a big difference between yes and no. i am guessing full load pressure is probably what coach manufacturer recommended for. think about those big trucks - 18 wheelers, one way they loaded up with full weight capacity, on the way back, they might have nothing to carry. i believe their tires may well be maintained at max load pressures 24/7. my sumitomo has 125psi rating, so i'm safe. ride quality is not bad. but next time i'll weigh and see.

happy trails to you and all!!
(from banff, ab)
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Old 08-16-2015, 09:28 AM   #27
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CountryFit, that is amazing. I am just hoping to break 7 MPG some day. We weigh 43K+ and tow a F150 crw cab.
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Old 08-16-2015, 09:41 AM   #28
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I'm not sure about mileage but I do know it costs a lot less to fill my rig if I do so before the gauge gets to the half tank mark.

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