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Old 05-15-2010, 09:29 PM   #29
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i run cruise 90% of the time, if not i tend to sloooooow down, my throttle pedal spring really pushes back against me.
but going out towards nm i shut if off because it would down shift to 5th and really pull boost trying to stay at 65

not to be a stinker...but if i drove this beast at 55, i would surely get blasted off the road by lots of bigger than me machines

i have just accepted 7 mpg as my rule to use for gauging how far we go till fuel and planning for trips.
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Old 05-15-2010, 10:02 PM   #30
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I unhooked my dash a/c compressor at engine and just run coach a/c's. The gen burns 1/2 to 3/4 gph. Dash a/c compressor makes engine work harder. I can usually get 11 to 12 mpg running 75 on run to beach on flat to easy rolling terrain even with head wind. This is in my 00 Discovery 38 with Cummins 275 with cruise off, keeps me awake. Dont have VMSpc yet but I think this is RV's sweet spot because was running 65 before and was in hurry getting to beach one evening so ran 75 and burned considerablly less fuel. Also tended to drop into fifth gear alot when running 60-65 mph. Maybe engine has been chipped up?? I'm sure this would change in mountainous area.
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Old 05-15-2010, 11:36 PM   #31
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I unhooked my dash a/c compressor at engine and just run coach a/c's. The gen burns 1/2 to 3/4 gph. Dash a/c compressor makes engine work harder. I can usually get 11 to 12 mpg running 75 on run to beach on flat to easy rolling terrain even with head wind. This is in my 00 Discovery 38 with Cummins 275 with cruise off, keeps me awake. Dont have VMSpc yet but I think this is RV's sweet spot because was running 65 before and was in hurry getting to beach one evening so ran 75 and burned considerablly less fuel. Also tended to drop into fifth gear alot when running 60-65 mph. Maybe engine has been chipped up?? I'm sure this would change in mountainous area.
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You are lucky the faster you go the less your machine Burns mine is totally the other way around, so I think because the faster I go the higher the rpm is, and I only use the cruise control on flat roads.
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Old 05-16-2010, 07:36 PM   #32
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My last two tank have been 10.25 and 10.3 (hand calculated) I two a CRV and that is a mix of city highway in fairly hilly terrain of the north east
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Old 05-17-2010, 07:54 AM   #33
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Thanks for a lot of great information on why MPG differ around the country. Always knew East coast better mileage and out west in the higher elevation lower mileage. Another reason I get lower MPG is once we go out on the road the DW keeps buying you name it for the grand kids. Sometimes I carry this stuff for 10-11 months before we get back home.
With my coach I get over all for the time on the road 6.5-6.7 mpg normal speed 58-62 anything over 66-67 mph it drop down into low 6.1. This past month going from Las Vegas-Cody, WY-to Moscow, Iowa down to 5.6. From Moscow to NJ back up 6.9 mpg.
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Old 05-17-2010, 08:28 AM   #34
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With my coach I get over all for the time on the road 6.5-6.7 mpg normal speed 58-62 anything over 66-67 mph it drop down into low 6.1. This past month going from Las Vegas-Cody, WY-to Moscow, Iowa down to 5.6. From Moscow to NJ back up 6.9 mpg.
I know the motorhome you have and that seems low for fuel mileage. I have a 2005 Dutch Star with a Cummins 370 hp ISL and fully loaded for fulltiming it weighs 31,000 and I tow a 2007 Honda CR-V, so the total weight is just under 35,000 pounds.

The first 10K miles it averaged 7.88 mpg and after starting to get broken in it increased to 8.3 mpg. A couple of years ago I switched to Michelin 275/80 XZA3 tires and I run 5 psi over the inflation recommended by Michelin for the weights. At the same time I read glowing reports about Opti-Lube fuel additive and I have used it since then. (When I changed the tires I had Spartan reprogram the ECM for the new tires and the spedometer and my GPS are exactly the same at 60 mph.)

The last 12K miles it has averaged 9.3 mpg with a low of 8.3 mpg and a high of 9.9 mpg. This includes some climbs over the Rocky Mountains and two trips over the Canadian Rockies. I usually drive about 62 mph, but last summer I kept the speed about 65-66 mph.

All of my caculations are with a pencil and paper instead of relying on my Silver VMSpc which is sometimes off by about 0.3 mpg.
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Old 05-17-2010, 08:41 AM   #35
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Does anyone know how to reset the cat trip computer for the average MPG I don't k know if its possible
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Old 05-17-2010, 08:48 AM   #36
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Well I'm in a beautiful little vacation at Disney right now and I spoke with a lady that they have a 45 foot feather light and they only get 5.5mpg on a good day so at that point I realized that there are worst cases then mine.
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Old 05-17-2010, 11:04 PM   #37
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We have a large motor home with a C12. According to the computer we get between 7-8. Usually in the 7.5 range. We weight about 45,000. Add the Saturn and we are in the 48,000 range.
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Old 05-17-2010, 11:17 PM   #38
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The last MPG calculation gave us a result of 17.46.

Suddenly mileage was twice as good! I may have forgotten one fuel stop. 8.73 seems more realistic, yes?
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Old 05-18-2010, 08:44 AM   #39
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no body knows if the cat trip computer can be reset?
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Old 05-18-2010, 11:03 AM   #40
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The Computers are usually not Cat and mine can be reset.
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Old 05-18-2010, 05:18 PM   #41
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OK how do you reset it?
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Old 05-18-2010, 07:11 PM   #42
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