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11-22-2016, 10:16 AM
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#1
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Member
Join Date: Jul 2015
Location: Florida
Posts: 55
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Fuel Mileage
I have a 2016 Cornerstone with 10,000 miles on it with a 600 ISX what fuel mileage should I expect to get driving in Florida at 71 or 72 miles a hour
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Paul & Cheryl
2016 Cornerstone K
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11-22-2016, 10:59 AM
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#2
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Senior Member
Join Date: Apr 2004
Location: Stillwater, Ok
Posts: 4,802
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Slightly under 7 at that speed would be my expectation. I get 7 or barley over at 63-65 most all of the time.
2016 45 B Topaz Cornerstone
2014 MKT towed
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2020 New Aire 3543
2018 Lincoln MKX
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11-22-2016, 11:37 AM
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#3
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FLT826MBR man
Texas Boomers Club Entegra Owners Club
Join Date: Jun 2009
Posts: 2,075
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Quote:
Originally Posted by paulp2354
I have a 2016 Cornerstone with 10,000 miles on it with a 600 ISX what fuel mileage should I expect to get driving in Florida at 71 or 72 miles a hour
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Towing? Wind direction? Both will affect. I'm lucky to average 7 towing F-150 with calm conditions. Once got almost 9 on a leg with STRONG tail wind.
Your engine still isn't broken in, either.
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[COLOR=red]2022 KZ Durango D333RLT
[FONT=Arial][COLOR=red] Towed by2022 F-250 Lariat 7.3 Godzilla gas 10 speed , Texas Boomers RV Club
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11-22-2016, 12:12 PM
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#4
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Senior Member
Entegra Owners Club
Join Date: Apr 2007
Location: SW FL
Posts: 29,327
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Paul, DSL417 just did a post regarding Cummins ISX upgrades and performance. Might want to call Cummins and see if you are do any updates and TSB's. (Technical Service Bullitens)
I can relate to my 450 non-upgraded ECM. On a trip to CA last year I averaged 6.4 MPG and lacked power on the hills.
This summer I had the updates preformed at Cummins. It took 13 computer updates, my mileage increased from 6.4 to 7.3 at 68-70 MPH and I now have power coming up an onramp.
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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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11-22-2016, 12:19 PM
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#5
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Senior Member
Join Date: Jun 2016
Posts: 827
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Try using Lucas fuel additive. It works
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11-22-2016, 06:23 PM
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#6
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Member
Join Date: Jul 2015
Location: Florida
Posts: 55
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Thank You to all for the good information
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Paul & Cheryl
2016 Cornerstone K
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11-22-2016, 06:33 PM
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#7
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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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My ISX 650 is averaging 7.6 over 47,000 miles. Goes down a little in the winter with winter blend fuel too.
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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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11-22-2016, 06:37 PM
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#8
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Senior Member
Join Date: Aug 2013
Location: Florida
Posts: 1,111
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My 450 gets 8.3; pulling 25ft car hauler.
"Finally"
Sent from somewhere in the USA
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Finally!!! 
Shawn and Donna
2014 Entegra Aspire 42RBQ, 2016 Mazda MX5 Miata
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11-22-2016, 08:10 PM
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#9
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FLT826MBR man
Texas Boomers Club Entegra Owners Club
Join Date: Jun 2009
Posts: 2,075
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Quote:
Originally Posted by Mr_D
My ISX 650 is averaging 7.6 over 47,000 miles. Goes down a little in the winter with winter blend fuel too.
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Think the older engines (without some of the pollution control junk) get a little better mileage.
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[COLOR=red]2022 KZ Durango D333RLT
[FONT=Arial][COLOR=red] Towed by2022 F-250 Lariat 7.3 Godzilla gas 10 speed , Texas Boomers RV Club
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11-22-2016, 08:19 PM
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#10
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Senior Member
Join Date: Apr 2004
Location: Stillwater, Ok
Posts: 4,802
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Quote:
Originally Posted by dlovitt
Think the older engines (without some of the pollution control junk) get a little better mileage.
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Yep, and no DEF, only drawback, black smoke coming at toad and soot on it once in a while. JMHO
2016 45 B Topaz Cornerstone
2014 MKT towed
__________________
2020 New Aire 3543
2018 Lincoln MKX
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