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  #1  
Old 03-08-2017, 04:23 PM
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AVG. MPG 5.7 Hemi

Just curious. My ,New to me 6 months, Summit MY14 with 5.7 Hemi is averaging about 13.5 MPG around town. I took it on a 250 mile round trip and averaged 16.6 MPG. Is this what you guys are experiencing. Been experimenting with ECO on and off does't really make any difference. I usually drive with ECO off.

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  #2  
Old 03-08-2017, 04:36 PM
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Re: AVG. MPG 5.7 Hemi

If you are doing heavy city that 13.5 is not out of line the hemi will be bad on all city but but 16.6 for highway is atrocious there is something wrong there. I got 22-23 highway at 70-75 last week with 4x4 hemi on a trip. Your speed will make a lot of difference 70 and below youll be into the MDS a decent amount and run on 4 cylinders which helps a lot, above 70 less MDS and your mileage will go down. I run regular fuel.
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Old 03-08-2017, 04:37 PM
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Re: AVG. MPG 5.7 Hemi

There are several threads on this subject already...

My warm weather averages are 16 in general rural driving and 20-22 hwy....less in the winter for general rural 14.5-15 or so and 20 hwy.

Your driving style can GREATLY affect fuel economy, too. I have a very light foot and get noticeably better results than my spouse and my daughter with the same vehicle in the same conditions. (I also get much longer brake life, too.. )
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Old 03-08-2017, 04:43 PM
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Re: AVG. MPG 5.7 Hemi

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Originally Posted by silvermax04 View Post
If you are doing heavy city that 13.5 is not out of line the hemi will be bad on all city but but 16.6 for highway is atrocious there is something wrong there. I got 22-23 highway at 70-75 last week with 4x4 hemi on a trip. Your speed will make a lot of difference 70 and below youll be into the MDS a decent amount and run on 4 cylinders which helps a lot, above 70 less MDS and your mileage will go down. I run regular fuel.
I have been running Mid grade fuel and on my long trips I have a heavy foot 75-85. Didn't realize the MDS is reduced with higher speeds. My next trip maybe I'll slow down a little if I can love driving this JEEP.
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Old 03-08-2017, 04:57 PM
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Re: AVG. MPG 5.7 Hemi

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I have been running Mid grade fuel and on my long trips I have a heavy foot 75-85. Didn't realize the MDS is reduced with higher speeds. My next trip maybe I'll slow down a little if I can love driving this JEEP.
The load becomes to much for the mds seems around low 70s and it starts kicking back from 4 to 8 cylinders more often has been my experience. At 85 its probably not on at all lol, unless maybe a down hill. If you want to see really good numbers set your cruise at 65 on some of these slower highways and you are in MDS alot and 24-25 can be had.
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Old 03-08-2017, 06:01 PM
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Re: AVG. MPG 5.7 Hemi

Average 16.5 mpg with 87 octane
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Old 03-08-2017, 07:41 PM
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Re: AVG. MPG 5.7 Hemi

16 or so here.
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Old 03-09-2017, 12:04 AM
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Re: AVG. MPG 5.7 Hemi

18.5 here in winter weather (more highway driving) - around 14 city and around 20 highway.
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Old 03-09-2017, 04:12 AM
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Curious as well. With my 06 Durango Hemi I am getting about 11.5-12mpg due to me letting it warm up for about 20 minutes every morning to give me heat when I leave. I also do about 85 on the highway and beating the crap out of lately to pass the time lol.

If i baby it I get about 14.5mpg in the summer. If I really baby it I can get upwards of 15.5-16.0mpg but that's granny driving. Highway I get about 18-19mpg at 60-65mph.

I don't really care anymore. I was saying for years that my next vehicle would have greatly better fuel economy but screw that. To to fun to drive these and I eagerly wait to see the improvements in the engine and 8 speed tranny compared to the 5 I currently have.
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Old 03-09-2017, 07:28 AM
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Re: AVG. MPG 5.7 Hemi

My 2014 Hemi would always say 16.9 on the DIC. No matter when I'd reset it, it would always go back to 16.9 in about a week. My hand calculation was always around 16.

My Pentastar is the big liar. It always says it averages 19.2 but hand calc says 17 lol
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Old 03-09-2017, 09:40 AM
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Re: AVG. MPG 5.7 Hemi

Quote:
Originally Posted by Jim_in_PA View Post
There are several threads on this subject already...

My warm weather averages are 16 in general rural driving and 20-22 hwy....less in the winter for general rural 14.5-15 or so and 20 hwy.

Your driving style can GREATLY affect fuel economy, too. I have a very light foot and get noticeably better results than my spouse and my daughter with the same vehicle in the same conditions. (I also get much longer brake life, too.. )
Mine is pretty much inline with Jim's. '14 V8 4X4 with almost 16K miles and 17 MPG lifetime average including both city/hwy. Not bad for a 5200 lb. SUV!
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Old 03-09-2017, 12:28 PM
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Re: AVG. MPG 5.7 Hemi

My 2012 had a lift and oversized KO2's and I was getting about 14 city and could run it up to ~19 highway. This was with the 6 speed tranny and oversized tires so I'd say something isn't quite right unless you're averaging 85-90 on the highway.
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