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Old 05-17-2015, 05:51 PM   #1
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Fuel mileage with 330 Cat

Just wondering here,all you guys with this 330 Cat,which is a great engine,mind you, but in my humble opinion really sucks a big one when it comes to economy. Came out of a 94 Vectra with a 5.9 6 speed Allison which I put 25k on and only twice dropped under 10mpg. Almost always towing 5 to 6k. Ran the eastern seaboard to key west and got 13 flying solo! And it was a 35 footer. Now this 2004 journey on a freightliner chassis with the 330 can't break 8 mpg in the most favorable conditions. Did a 2200 mile round trip to fla pulling my little wrangler down and bringing back my new Husky cargo trailer and averaged 7.6 for the trip! Now just for comparison,my freightliner tractor with a 430 Detroit bob tailing will get between 9 and 10 and it weighs 23000, but is not nearly as aerodynamic. And I never drive over 60mpg,so I don't want to hear that! Again,just wondering what some of you are averaging
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Old 05-17-2015, 06:06 PM   #2
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I can't speak for the cat BUT my cummins 330 gets 8ish at 70. i too had a 5.9 in a winnie and it also got well over 10 but on its best day would not run the hills like the 8.3 does.
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Old 05-17-2015, 06:08 PM   #3
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Few would argue that the 5.9 Cummins is the RV fuel mileage king.

My 300 hp. 3126B , has got up to 9.3 on segments of a trip, I-5 in CA at the 55 MPH tow limit , overall though , on my 1600 mile run to my snowbird site 8 would be normal , lower if I have a few bad days . ( headwind)

Rolling weight, coach and toad 31,500 lbs.

If you have a side radiator , check the rad fan cycling, I had to do a section of one trip with the fan running full time due to a controller failure and mileage dropped considerably.
If you haven't seen this Cat pdf file , there may be something helpful in it for you.
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File Type: pdf Cat_RV_Performance.pdf (246.3 KB, 228 views)
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Old 05-17-2015, 06:33 PM   #4
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Quote:
Originally Posted by meyr View Post
Just wondering here,all you guys with this 330 Cat,which is a great engine,mind you, but in my humble opinion really sucks a big one when it comes to economy. Came out of a 94 Vectra with a 5.9 6 speed Allison which I put 25k on and only twice dropped under 10mpg. Almost always towing 5 to 6k. Ran the eastern seaboard to key west and got 13 flying solo! And it was a 35 footer. Now this 2004 journey on a freightliner chassis with the 330 can't break 8 mpg in the most favorable conditions. Did a 2200 mile round trip to fla pulling my little wrangler down and bringing back my new Husky cargo trailer and averaged 7.6 for the trip! Now just for comparison,my freightliner tractor with a 430 Detroit bob tailing will get between 9 and 10 and it weighs 23000, but is not nearly as aerodynamic. And I never drive over 60mpg,so I don't want to hear that! Again,just wondering what some of you are averaging
meyr
I can't speak for the 330hp Cat.

However...I have averaged 8.5 MPG, over 113,000 miles, (in 14 years), with my 21,000# coach towing a 3,000# Saturn 4 down, (usual highway speed 60 MPH).
BTW, 14,000 gallons is a lot of diesel fuel.

Mel
'96 Safari, 250 hp 3125 Cat,
140,000 miles, (mine since '01)
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Old 05-17-2015, 09:55 PM   #5
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meyr,
We have a sort of sister ship to yours. It's an '04 Itasca Horizon 36GD with the C-7 330HP CAT. We've owned now for right at 4 years and have put right at 22,000 miles on it. We have ran solo for only one trip and it was basically a flat trip and, right around 55-60 mph. On that trip, and that trip alone, I got close to 9 mpg.

But, for all other trips, including some long ones to us, right around 1700 miles at a stretch, and towing a full sized truck, an '11 GMC Sierra 1500 4x4 Extended Cab which, is carrying an '08 Honda GL 1800 Goldwing. The coach itself weighs 26,120 loaded for trips. The truck, right at 5,300 lbs. The bike is 900 lbs. and the lift that carries the bike is, over 275 lbs. So, needless to say, we're sporting about 6,500 lbs. behind us plus our weight.

And, for all those trips, with all that weight, we average a whopping 7-8. It's really hard to get an accurate figure because that dumb a$$ fuel filling system, on both sides, gives me a bunch of crap when it gets close to full. I have fill-click, fill-click-fill-click for up to around 8-10 minutes 'till the fuel is up to the top of the filler neck. And even then, sometimes it's not full, according to the gauge.

I have seen reports on here that some folks SAY they get 10 mpg with a CAT like ours. Well, I'd have to see it for myself and, basically experience it for myself too, in order to believe it. I'm pretty much a conservative driver. We hover very close to 62 mph. The motor is purring along at around 1650-1700. The tires are at what Michelin recommends for the weight on each axle. Heck, I even keep the truck tires at close to 50 which, is seriously over inflated, just for trailering it.

If we're going to remain at a campsite for more than a few days, I bleed them down to what they're supposed to be.

So, you're not alone in the big SEVEN MPG scenario. Not by a long shot. The TRUE folks out here are right along with you. It is what it is. They're rolling Kleenex boxes, that's for sure. Not much aerodynamics there.
Scott

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Old 05-17-2015, 10:09 PM   #6
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We had a 3126 300 Hp in our 2000 Dutch Star that we traded in in 2002. I don't remember what mileage we got anymore.
I do know figured 7.5 with the '02 DSDP with Cummins ISC 350, both before and after the Banks kit was added.
The present Magna that weighs 50,000#'s (GVWR is 54,000#, and GCVWR is 65,000#'s) still gets us 7.6 on the VMS even with a 650 ISX.
Seems like the ISB 5.9 is the mileage "champion" but none of us are going to get very good mileage pushing a double size barn door!
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Old 05-17-2015, 11:25 PM   #7
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I just ran between Cleveland and Seatlte with our 2004 Newmar with Cummins ISB 300 hp and got a solid 10 mpg.
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Old 05-18-2015, 06:22 AM   #8
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I have been keeping track for approx. 40,000 miles and my running total is 9.5 mile per Imperial Gallon. Converting that to the American Gallon which is around 5/6 of an Imperial Gallon it equate to 7.91 mile per gallon. Our unit is a 2004 DSDP which weighs in at 29,300 and our toad is a Ford Edge which is around 4,000 lbs. My speed is generally in the range of 62-64 mph. It would be nice if all our trips were done with a tail wind but that it is not the norm so we travel on and enjoy.
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Old 05-18-2015, 06:48 AM   #9
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In my 2003 Dutch Star with the 330hp Cat, I only get 7.2 mpg with cruise control on. This is based on using a Scan Gauge D. I have a side radiator with a hydraulic driven fan that is suppose to be variable speed, that I just discovered is not. My fan stays on high all the time and I've read that it takes about 45hp to turn the fan at high speed. Once I get the new fan controller installed I'm hoping the mileage will improve a little, at least when the dash a/c is not on.


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Old 05-18-2015, 06:51 AM   #10
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We have averaged 7.9 MPG for the last 36,000 miles with the CAT 330, toad and keeping the maximum speed to 65 MPH.
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Old 05-18-2015, 07:48 AM   #11
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meyr,
I have seen reports on here that some folks SAY they get 10 mpg with a CAT like ours. Well, I'd have to see it for myself and, basically experience it for myself too, in order to believe it. The TRUE folks out here are right along with you. It is what it is.
FIRE UP

IMO anyone reporting a long haul/consistent MPG of 10-11 with a large diesel powered class A coach is either:
1.) Figuring his mileage WRONG... (because he doesn't know how?).
2.) LYING... (to make himself feel better... or ?).

I can truthfully report that although I have sometimes seen as many as 11.5 MPG on a single tank... OVERALL my coach has averaged 8.5 MPG for the 113,000 miles I've driven my coach.

Mel
'96 Safari, 250hp 3126 Cat, 140k miles
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Old 05-18-2015, 09:09 AM   #12
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FIRE UP

IMO anyone reporting a long haul/consistent MPG of 10-11 with a large diesel powered class A coach is either:
1.) Figuring his mileage WRONG... (because he doesn't know how?).
2.) LYING... (to make himself feel better... or ?).
3. Or they have a ISB

All Fuel & Miles recorded on a spreadsheet.
57,501 miles
5,639 Gal
10.196 MPG

Almost all miles pulling a 2,500 lb trailer or Toad from 3,300 to 4,400 lb
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Old 05-18-2015, 09:15 AM   #13
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On our last Winter tour of the Southwest we drove 4516 miles over six weeks.

I kept track of all fuel purchases and our overall mpg was about 8.2.

I drove the speed limit most of the time, which was usually at least 70mph, and we towed our Demco Dolly and our VW Passat TDI.

We drove in a lot of mountains and wind.

I thought that wasn't too bad.
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Old 05-18-2015, 12:44 PM   #14
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Ok then, I guess I'm right in the same ballpark as almost all of you. The guy with the ISX getting ten I'm a little skeptical of though. I'm sure motor homes are no different than semis when it comes to on board computing. However I have learned over my many years first thing you do is MANUALLY calculate your speedometer and your first few thousand miles of mpg and compare to what your Ecm is telling you and adjust from there. I still have my old Vectra, and am seriously thinking about dumping this 04 just running my old 5.9. The journey was a step up,but honestly the air ride suspension verses the soft ride springs in the Vectra are pretty darn close to equal. The 5.9 takes a while to spool up from a stop, but once up to speed she'll run just fine. Found out if you have niceties like bedroom closet slide outs and such,the wife just drags more crap along. Gonna ponder this awhile, but I sure do miss my 10+.
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