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Old 11-22-2016, 10:16 AM   #1
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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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Old 11-22-2016, 10:59 AM   #2
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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.


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Old 11-22-2016, 11:37 AM   #3
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Quote:
Originally Posted by paulp2354 View Post
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
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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Old 11-22-2016, 12:12 PM   #4
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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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Old 11-22-2016, 12:19 PM   #5
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Try using Lucas fuel additive. It works
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Old 11-22-2016, 06:23 PM   #6
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Thank You to all for the good information
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Old 11-22-2016, 06:33 PM   #7
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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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Old 11-22-2016, 06:37 PM   #8
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My 450 gets 8.3; pulling 25ft car hauler.


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Old 11-22-2016, 08:10 PM   #9
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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.
Think the older engines (without some of the pollution control junk) get a little better mileage.
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Old 11-22-2016, 08:19 PM   #10
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Think the older engines (without some of the pollution control junk) get a little better mileage.

Yep, and no DEF, only drawback, black smoke coming at toad and soot on it once in a while. JMHO


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