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09-17-2012, 11:49 PM
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#1
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Junior Member
Join Date: Sep 2012
Posts: 8
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Class C fuel economy
I have a 1995 Chevy class C mh 23' with a 454 engine. I completed my first trip in it and calculated the gas mileage at 8.8 mpg US. This seems low. What is everyone else getting? I believe the Vortec engine came out in 1996 which had better mileage.
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09-17-2012, 11:52 PM
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#2
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Nope, actually that's better than a lot of them. Besides, one trip isn't enough to calculate fuel mileage from. We're close to 40,000 on our DSDP and even that's not enough for an accurate calculation.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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09-17-2012, 11:54 PM
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#3
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Senior Member
Join Date: Feb 2012
Posts: 122
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I have a 1988 23ft Class A with a Dodge 360 with a 3 speed tranny and I get @10-11 mpg US.
My GVWR is 10,400 and my RV weighs @ 8,000
I hope this helps, IAN...
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09-17-2012, 11:58 PM
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#4
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by imorton
I have a 1988 23ft Class A with a Dodge 360 with a 3 speed tranny and I get @10-11 mpg US.
My GVWR is 10,400 and my RV weighs @ 8,000
I hope this helps, IAN...
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The 360 should get better mileage than the 454! The old 454's weren't known for good fuel (or oil) mileage.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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09-18-2012, 03:56 AM
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#5
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Moderator Emeritus
Ford Super Duty Owner
Join Date: Aug 2000
Location: Bryan, TX when not traveling.
Posts: 22,948
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How fast were you driving and were you pulling a dinghy?
Mileage sounds about right for 65 mph. I have yet to actually meet someone getting the claimed 10+ mpg that didn't drive below 55 mph.
Ken
__________________
Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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09-18-2012, 06:53 AM
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#6
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Senior Member
Join Date: Apr 2004
Posts: 3,797
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You might have the throttle body fuel injection that came before the port injection of the Vortec, but it's still better than a carburated 454. Try these:
Don't drive your RV like a car. Think of having an egg between your foot and the gas pedal
Slow down 75 to 65 to 60, or maybe 55MPH
If you don't have them, radial tires help improve mileage
Tune your engine. Use the maximum ignition advance that it will tolerate without pinging. Also, fresh air cleaner, etc.
Make a cold air intake from dryer vent hose. Mount one end under the front bumper, and point the other end at the air cleaner
Get a Flying J RV card. .02/gallon discount off the cash gas price, and allows use of your personal credit card for whatever rewards it offers.
Quote:
Originally Posted by CHATEAUSPORT
I have a 1995 Chevy class C mh 23' with a 454 engine. I completed my first trip in it and calculated the gas mileage at 8.8 mpg US. This seems low. What is everyone else getting? I believe the Vortec engine came out in 1996 which had better mileage.
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__________________
George Schweikle Lexington, KY
2005 Safari (Monaco)Trek 28RB2, Workhorse W20, 8.1, Allison 1000 5 spd, UltraPower engine & tranny, Track bars & sway bars, KONI FSD, FMCA 190830, Safari Int'l. chapter. 1999 Safari Trek 2830, 1995 Safari Trek 2430, 1983 Winnebago Chieftain, 1976 Midas Mini
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09-18-2012, 07:57 PM
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#7
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Senior Member
Fleetwood Owners Club
Join Date: Nov 2011
Posts: 1,143
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My 2001 with the 454 (2000 Chevy model year) does 10.4 mpg best case driving around 60 mph. Go above that and it drops. Worst tank was about 8 mpg but that was across the rockies and several passes.
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History:'05 Concord, '08 View, '05 Chinook, '01 Jamboree 24D, '78 Apache Popup, 81 Komfort Tlr,
84 Mazda B2000 'w canopy,Tent from wedding in '96
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09-19-2012, 12:48 AM
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#8
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Junior Member
Join Date: Sep 2012
Posts: 8
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The trip was about 1000 miles and I averaged 60 mph and almost never went over 65 mph. I changed the oil and installed a new air filter. I wasn't towing anything and no big mountain climbs. Thanks for the tips.
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09-19-2012, 06:28 AM
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#9
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Nov 2009
Posts: 1,363
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Quote:
Originally Posted by Mr_D
Nope, actually that's better than a lot of them. Besides, one trip isn't enough to calculate fuel mileage from. We're close to 40,000 on our DSDP and even that's not enough for an accurate calculation.
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huh?? Why cant you tabulate MPG from 1 or 2 tank fulls? Its called an average for a reason. Saying you need XX,XXX miles for a mpg calculation is absurd. Well unless you have thousands of dollars of expensive telemetry isolating every facet of MPG.
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09-24-2012, 09:11 PM
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#10
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Senior Member
Join Date: Jul 2012
Location: La Porte, Texas
Posts: 192
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MPG
MY 2011 Chateau 31 / Ford E450 usually gets about 8.3 with the generator running and about 9mpg with the generator off, I usually set my cruise on 63 mph.
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09-24-2012, 09:18 PM
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#11
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by WeatherTodd
huh?? Why cant you tabulate MPG from 1 or 2 tank fulls? Its called an average for a reason. Saying you need XX,XXX miles for a mpg calculation is absurd. Well unless you have thousands of dollars of expensive telemetry isolating every facet of MPG.
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I said ACCURATE fuel mileage figures, not just estimates that are sure to be wrong!
Cummins says 140,000 miles.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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09-27-2012, 07:48 PM
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#12
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Member
Join Date: Aug 2012
Posts: 48
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Quote:
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Originally Posted by Mr_D
I said ACCURATE fuel mileage figures, not just estimates that are sure to be wrong!
Cummins says 140,000 miles.
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No way, how many sets of tires will you have gone through driving 140,000 miles? Way too many variables come into play over that much distance.
Unless every trip is exactly the same under the exact conditions all you will ever get is an estimate.
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09-27-2012, 10:18 PM
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#13
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Member
Join Date: Sep 2012
Location: Everett Washington
Posts: 40
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Quote:
Originally Posted by Mr_D
I said ACCURATE fuel mileage figures, not just estimates that are sure to be wrong!
Cummins says 140,000 miles.
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Hi Mr_D, where did you see Cummins recommendation of driving for 140K to figure out fuel economy?
I hope I don't sound like a smart Alec but I just happend to work on the daily basis on Cummins M-11, ISC, ISL, and Caterpillar C-9 engines, and I never read or heard of such a thing!
By using factory electronic diagnostic equipment you CAN monitor(among many other values -fuel pressure, coolant temp, ambien temp, intake air temp. turbo boost etc.)fuel economy at any given moment and/or on each trip!
My 2001 Itasca Spirit 29N, on E-450 FORD V10 fully loaded and towing KK Demco SS with 3400 pounds car, staying @ 60 - 63 MPH gives me 7,8 - 8,7 MPG. This includes driving over long and steep passes, and occasionally using generator, and A/C.
__________________
G.T.
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09-27-2012, 10:25 PM
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#14
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by islecop92
No way, how many sets of tires will you have gone through driving 140,000 miles? Way too many variables come into play over that much distance.
Unless every trip is exactly the same under the exact conditions all you will ever get is an estimate.
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OK, here's the white paper for you disbelievers!
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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