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05-25-2015, 07:01 PM
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#1
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Senior Member
Join Date: Jul 2012
Location: New Braunfels, TX
Posts: 492
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Speed versus Diesel Use
I have a 2012 Aspire DEQ / 2011 Jeep Liberty and due to an impending meeting I conducted an experiment regarding diesel usage based on speed. I had to get to my destination in a speedy manner in order have Internet and cell phone access.
At the last minute, this weekend we took a trip from New Braunfels, Tx to Mercedes, Tx overnighting for the weekend at Llano Grande Resort. The resort is a typical 55+ community and a Winter Texas haven. It was relaxing but too quiet since everyone had left for the summer. If you go stay in the North park.
Results:
Trip from New Braunfels to Mercedes - 287 miles
Average speed 68 MPH cruise control
MPG - 6.7
Diesel used: 3/4 tank
NOTE: Made meeting with 30 Minutes to spare.
Trip from Mercedes to New Braunfels - 287 miles
Average speed 60 MPH cruise control
MPG - 10.3
Diesel Used: just under 1/2 tank or about 3/8ths
I realize this was not a scientific test but I must admit I was surprised with the results, and 10.3 MPG surprised me even more!!! So although I'm not retired and sometimes the trip might need to go a little faster due to upcoming meetings or work, I think I'll try to take my time and save the money while enjoying the ride and views. Lesson Learned!!!
Note: Results may vary depending on your driving habits.
Jeff & Terri Burklo
2012 Aspire / 2011 Jeep Liberty
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05-25-2015, 07:07 PM
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#2
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Senior Member
Damon Owners Club Freightliner Owners Club
Join Date: Mar 2006
Location: North East Texas
Posts: 4,946
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i believe it
I just cant drive 60, i would fight sleep,
we do 65-66 and still squeeze 7.5 or so most trips. i understand we are a different bus, but the speed part does matter.
__________________
USN Retired, Life time member of the DAV.
Enjoying the 2008 Damon Tuscany 4056, #3998 no your eyes are fine, there are really 6 slides
2022 F150 King Ranch or 2012 Edge toads
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05-25-2015, 07:15 PM
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#3
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Member
Join Date: Sep 2013
Posts: 87
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Impressive. I'm not yet driving a diesel, but I'm thinking I should be following your example. ;-)
__________________
Clyde
2015 Dutch Star 4018
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05-25-2015, 07:25 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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Let us know your results after 50,000 miles, a tankful is not enough, 10 tanks fulls is not enough either.
After 45,000+ miles our VMS shows 7.6.
__________________
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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05-25-2015, 07:42 PM
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#5
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Senior Member
Entegra Owners Club
Join Date: Apr 2007
Location: SW FL
Posts: 31,735
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Jeff,
Your mileage makes me feel better. I drove our MH up to the Tampa rally, 125 miles and was testing the new rear end out. Running 68 and putting my foot into it a few times testing for noise, 5.7 mpg.
__________________
Chuck in SW FL
Digital 2021 Cornerstone "B"
A "Digital" 2019 Cornerstone "B" Traded
A "Classic" 2014 Anthem 42 RBQ---Sold
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05-25-2015, 08:57 PM
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#6
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Senior Member
Join Date: Feb 2012
Location: Southern California
Posts: 1,550
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Quote:
Originally Posted by Jburklo
I have a 2012 Aspire DEQ / 2011 Jeep Liberty and due to an impending meeting I conducted an experiment regarding diesel usage based on speed. I had to get to my destination in a speedy manner in order have Internet and cell phone access.
At the last minute, this weekend we took a trip from New Braunfels, Tx to Mercedes, Tx overnighting for the weekend at Llano Grande Resort. The resort is a typical 55+ community and a Winter Texas haven. It was relaxing but too quiet since everyone had left for the summer. If you go stay in the North park.
Results:
Trip from New Braunfels to Mercedes - 287 miles
Average speed 68 MPH cruise control
MPG - 6.7
Diesel used: 3/4 tank
NOTE: Made meeting with 30 Minutes to spare.
Trip from Mercedes to New Braunfels - 287 miles
Average speed 60 MPH cruise control
MPG - 10.3
Diesel Used: just under 1/2 tank or about 3/8ths
I realize this was not a scientific test but I must admit I was surprised with the results, and 10.3 MPG surprised me even more!!! So although I'm not retired and sometimes the trip might need to go a little faster due to upcoming meetings or work, I think I'll try to take my time and save the money while enjoying the ride and views. Lesson Learned!!!
Note: Results may vary depending on your driving habits.
Jeff & Terri Burklo
2012 Aspire / 2011 Jeep Liberty
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What engine do you have?
__________________
2006 Monaco Signature 45' Commander IV ISX 600 & 12.5 KW Genset
2013 Avalanche toad
And a rather large and very hairy Bear for a traveling companion
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05-25-2015, 10:33 PM
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#7
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Senior Member
Join Date: Jun 2010
Location: Sun City Center, FL
Posts: 1,847
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Sounds like physics actually works, huh?
__________________
Pat & Medarda Bauer; Tess and Tighe (our fur kids)
2017 Entegra Anthem/FL/Allison/Grand Cherokee
Entegra Coach Owners Association, President
Sun City Center, FL
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05-26-2015, 02:04 AM
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#8
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Senior Member
Newmar Owners Club
Join Date: Jan 2012
Location: Polk City, FL
Posts: 3,368
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I need to try it. I might hate it. But I gotta know.
Here's the weird thing about speed vs fuel. In my day job(nite-day-more nite job) I just flew a B777 jet from Shanghai to Memphis at max aircraft weight for takeoff. It takes 14 hrs and about 275k lbs of fuel (roughly 65,000 gals). As part of my job, when we reach level off we evaluate time vs fuel. If I fly a speed (called Mach) that is 5% more. I reach my destination about 8 mins sooner over 14 hrs yet costs about 2000lbs or about $1000. At 10% more speed the costs are even crazier yet the time changes little.
I'm thinking the tortoise vs the hare might have some benefits. Plus it has to be easier on tires, engines, and running gear,
__________________
Dave & Debbie
2021 Newmar DutchStar 4369
2016 Ford Edge&2019 Ford F-150 toads
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05-26-2015, 02:38 AM
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#9
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Moderator Emeritus
Join Date: Oct 2002
Location: Sheboygan, WI
Posts: 5,644
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Check out this tutorial on fuel economy and the various factors that affect it. Note the increase in wind resistance as speed increases.
RV Tech Library - Fuel Economy Tips
__________________
Mark & Leann Quasius
2016 Cornerstone 45A
2020 Jeep Gladiator Rubicon
2021 Jeep Wrangler Rubicon
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05-26-2015, 04:09 AM
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#10
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Senior Member
Join Date: Jan 2013
Location: Lawrenceville, GA
Posts: 254
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We've driven our 2012 RBQ almost 24,000 miles with the cruise set at 60 except for non-freeway driving, and driven almost everywhere between Petosky and Miami and up the east coast to Delaware, up mountains and own valleys, with an average of 9.1 mpg over all. Worst we've gotten has been 8.5 (40 mph headwind in Oklahoma and Texas) and the best has been 10.5 (Atlanta to Jacksonville), all this while pulling a full-size SUV. Besides the fuel cost advantages, we get to see and appreciate the scenery as we drive and almost never have to pull out and pass, since everyone else is going hell for leather in the fast lane(s). LOL all the way to the bank.
Bob & Jennifer Stevens
2012 Aspire RBQ
Zipper and Charlie (poodles)
__________________
Aussies (Bob & Jen)
Toy Poodle Zipper
Entegra Anthem 2019
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05-26-2015, 07:15 AM
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#11
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Senior Member
Join Date: Jul 2012
Location: Fulltime, USA
Posts: 16,706
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Speed versus Diesel Use
Mileage on a MH doesn't matter that much.
More speed is more fuel. So what?
I move everything I own 200 miles for about 100 bucks. I do 65. Mileage varies a bit, slower or faster, but not very much in the scheme of things. It is what it is. And the toad takes us on adventures at much better mpg.
Relax! Let the Journey be your Destination
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05-26-2015, 07:51 AM
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#12
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Senior Member
Join Date: May 2014
Posts: 1,368
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Good test, since also New Braunfels is just a little higher elevation than Mercedes.
The only thing you didn't factor in was the winds on those trips.
But unless it was a really strong head wind or tail wind, the difference is negligible.
You used real world testing, and that's what we should pay attention to.
Thanks
__________________
Dan & Loretta, US Army Retired Aero Scout Pilot
2012 Fleetwood Providence 42P Class A/DP
Spartan Chassis, 8.9L Cummins 450HP
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05-26-2015, 08:05 AM
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#13
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Senior Member
Monaco Owners Club
Join Date: Oct 2009
Location: On the road
Posts: 2,126
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https://cumminsengines.com/uploads/d...el_economy.pdf
Really good read...
The "secret" has ben out for quite awhile. Speed kills dinosaurs, or rather their juices.
__________________
Happy Trails,
06 Dynasty Countess III ISL//3060
07 Hummer H3
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05-26-2015, 09:19 AM
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#14
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Senior Member
Entegra Owners Club
Join Date: May 2014
Location: Thornhill, Ontario
Posts: 410
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Quote:
Originally Posted by Twomed
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Thanks, I had read this some time ago and was looking for it. It is very good reading.
__________________
Robert and Louise
Thornhill, Ontario
2014 Anthem 44SL and 2014 Ford Fusion Hybrid
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