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View Poll Results: What HIGHWAY gas mileage are you getting with your 2011 Grand Cherokee? (V8 only)
23 mpg or more 4 3.42%
20-22 mpg 37 31.62%
17-19 mpg 59 50.43%
14-16 mpg 14 11.97%
13 mpg or less 3 2.56%
Voters: 117. You may not vote on this poll

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  #25  
Old 01-21-2011, 05:23 PM
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Re: V8 highway gas mileage

Last two trips from central NH to northern NH has been 17.5 by math, EVIC said 16.7. Today's trip was in the snow. Less than perfect conditions.
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  #26  
Old 01-22-2011, 10:23 AM
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Re: V8 highway gas mileage

I would like to know how many of the 20 plus MPGs are 4x4 models? (I'm sure there are a few) Also as everyone knows speed is a big factor as is using the cruise control. I've had a few local highway trips of a little over 19 (that’s with winter blend fuel and very cold weather). Also I have only used 87 octane Phillips 66 as this is the best fuel mileage fuel I got from previous vehicles owned. I think that I can get 20 or more once my vehicle is broke in and the highway trip is longer than my recent 50-60 mile highway trips.

Overall this is a good poll….great idea….and a good job setting it up.
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  #27  
Old 01-22-2011, 10:49 AM
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Re: V8 highway gas mileage

Quote:
Originally Posted by WK2OverlandII View Post
I would like to know how many of the 20 plus MPGs are 4x4 models? (I'm sure there are a few) Also as everyone knows speed is a big factor as is using the cruise control. I've had a few local highway trips of a little over 19 (that’s with winter blend fuel and very cold weather). Also I have only used 87 octane Phillips 66 as this is the best fuel mileage fuel I got from previous vehicles owned. I think that I can get 20 or more once my vehicle is broke in and the highway trip is longer than my recent 50-60 mile highway trips.

Overall this is a good poll….great idea….and a good job setting it up.
Is there a reason you are neutering the performance of the Hemi with sub standard fuel? Recommended octane is 89, 87 is only in a pinch and the motor will pull out timing (i.e. power) when 87 is being used.
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  #28  
Old 01-22-2011, 02:07 PM
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Re: V8 highway gas mileage

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Originally Posted by mjw930 View Post
Is there a reason you are neutering the performance of the Hemi with sub standard fuel? Recommended octane is 89, 87 is only in a pinch and the motor will pull out timing (i.e. power) when 87 is being used.
I got better MPG with 87 as an experiment. And if I'm not running it hard it doesn't really matter. I do a LOT of highway driving at <2K RPMs. Is it a huge diff? No...but I thought I'd try it. I notice that it says 89 preferred in the manual and that's it. My wife's Commander w/ the Hemi says it on the gas cap.
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  #29  
Old 01-22-2011, 10:18 PM
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Re: V8 highway gas mileage

I average 10-11 mpg city. Well technically we don't live in a "city" being on Long Island but I suppose theres lights, and stop and go etc.. I would like to see it closer to the rated 13mpg city or at least know the conditions they had to achieve 13mpg for "city" driving but I know that won't happen. Using cruise control achieves better results obviously speaking however highway MPG is a completely different ball game. I haven't gone anywhere far by any means yet but I can keep it near 19-20 when I reset after a fuel up and jump on the highway for half an hour.
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  #30  
Old 01-23-2011, 10:06 AM
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Re: V8 highway gas mileage

Quote:
Originally Posted by mjw930 View Post
Is there a reason you are neutering the performance of the Hemi with sub standard fuel? Recommended octane is 89, 87 is only in a pinch and the motor will pull out timing (i.e. power) when 87 is being used.
When I read the owner’s manual (version 4) it says "87 octane acceptable and 89 recommended" I take it as just that…verbatim. If it said, "89 octane required" then I would use 89 only. I don't have any pinging, knocking, ticking, shuddering with the MDS, etc... To me it is more important to put quality gasoline in the vehicle than a higher octane. If you burn fuel with the 10% ethanol or other blends of fuel then you are doing more harm than not using 89 octane. I'm in the military and travel quite often. I'm originally from Pennsylvania and my Dad will only use Sunoco fuel. I can't get that here in Kansas. The best that I have found for performance and mileage is Phillips 66, 87 octane. Once in a while I will use 89 octane but for the most part will stay with a quality 87 octane unless I start having problems. Just my honest opinion and experience.
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  #31  
Old 01-23-2011, 10:28 AM
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Re: V8 highway gas mileage

I agree with the last post. I use Shell here in NJ with no issues
In a vehicle that is suppose to have 91 octane. Car runs great
So I plan to do the same with the GC.
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  #32  
Old 05-30-2011, 07:57 PM
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Re: V8 highway gas mileage

bump
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  #33  
Old 05-30-2011, 08:41 PM
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I'm getting over 20 mpg with the hemi. Just made a 4 hour road trip and at the end I had a half tank left. This is after a fill up, then about a 50 mile trip, THEN the 4 hour trip. I'm impressed.
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  #34  
Old 05-30-2011, 09:30 PM
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Re: V8 highway gas mileage

21 Every time with the cruise set at 82MPH and almost no traffic.
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  #35  
Old 05-30-2011, 09:32 PM
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Re: V8 highway gas mileage

Quote:
Originally Posted by WK2OverlandII View Post
When I read the owner’s manual (version 4) it says "87 octane acceptable and 89 recommended" I take it as just that…verbatim. If it said, "89 octane required" then I would use 89 only. I don't have any pinging, knocking, ticking, shuddering with the MDS, etc... To me it is more important to put quality gasoline in the vehicle than a higher octane. If you burn fuel with the 10% ethanol or other blends of fuel then you are doing more harm than not using 89 octane. I'm in the military and travel quite often. I'm originally from Pennsylvania and my Dad will only use Sunoco fuel. I can't get that here in Kansas. The best that I have found for performance and mileage is Phillips 66, 87 octane. Once in a while I will use 89 octane but for the most part will stay with a quality 87 octane unless I start having problems. Just my honest opinion and experience.
The engine will just adjust and de-tune itself by adjusting the timing a bit if you use 87, for me that's fine if I'm on a long highway trip.
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Old 05-30-2011, 09:43 PM
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Re: V8 highway gas mileage

I'm with CapeCodJeep above, I chose the Hemi 4X4 for the performance. Regardless, I find it interesting to track my mpg (as I do with my other cars).
I just finished a 2817 mile road trip over 9 days. The trip starting odometer was 982 miles, finishing was 3799 miles. The trip was west from Tulsa, over I-40 to the Grand Canyon, then back to Tulsa over interstate and secondary highways stopping at Carlsbad Caverns. The trip took me over the Continental divide twice, once at 7900 ft, the other at 8700 ft.
I filled up 9 times, comparing actual calculated mileage (miles/pump gallons) with the EVIC mileage. I used mid-grade octanes for the whole trip (88 at higher altitudes, 89 at lower).
Calculated mpg for the segments ranged from 17.6 (early in the trip) to 24.4.
The EVIC varied -4.1% to +5.4% from the actual mileage for the segments, for the entire trip the EVIC was 1.7% high.
MPG was 20.4 according to the EVIC, actual calculated was 20.05. I'd say 95% of the trip was highway mileage varying from 65 to 80 mph (80 is legal on I-20 in Texas).
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