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AVG. MPG 5.7 Hemi

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64K views 95 replies 54 participants last post by  joesurfer 
#1 ·
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.
 
#2 · (Edited)
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.
 
#4 ·
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:lol: if I can love driving this JEEP. :D
 
#3 · (Edited)
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.. :D)
 
#9 ·
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.
 
#12 ·
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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#14 ·
lowes07 - I use mid grade 89 too, around 12 MPG in all city driving, 16-17 MPG mostly Interstate driving. I like to accelerate off the line! :D This has been consistent with my last 3 V8 Jeep GC's.
 
#15 ·
Those numbers are about the same as mine. When I purchased the Jeep didn't expect great numbers with the HEMI. My heavy foot doesn't help much either. :lol: Really fun to drive:D. My next one is going to be an SRT.
 
#16 ·
^^^ Considering an SRT too... I figure I don't drive that many miles so MPG doesn't matter really. When someone says they get 30+ MPG with their car (not a GC) I look at them like how can that be as I have had V8's since forever. LOL
 
#17 ·
With the stock Latitudes at 38 PSI we were average a bit over 17, which was mixed urban/highway. Highway only less than 75 it would be around 21, falling off over that. With the BFG K02s that I put on the stock 18" wheels for winter/offroad it lost about 1-1.5 MPG. I really like the tires for winter driving.

For summer I picked up a set of the black vapor SRT "Spider Monkeys" ('15 SRT take-offs) with 295/45ZR20 Pirelli P Zero runflats (very heavy) for summer use. My guess is these will be the same or maybe even a bit worse than the BFG K02s in terms of fuel economy.

I can't say that we baby it, but isn't constantly flogged either.
 
#24 · (Edited)
Here is a trip example from my 2005 V8 GC in 2008 where I got 16.2 m.p.g.:

The Grand Cherokee was loaded up (no trailer) but not heavier than say four adults, drove 1318 miles in 19 hours (time includes stops for gas) and it took 81.75 gallons which equals averaging 70 m.p.h. (time includes stops for gas so really traveling closer to 75 m.p.h). Granted MPG may have improved some, but haven't noticed in my 2011 or 2014 V8 GC's. I though 16.2 m.p.g. was my best m.p.g. ever!
 
#26 ·
I hover around 14.5mpg with almost all country stop & go driving. I'm currently in a 2017 Ford Expedition rental while my Jeep gets some rear bumper damage fixed and this thing is getting 18.5mpg with the same driving habits and it feels huge and heavy compared to the Jeep ?
 
#27 ·
never calc'd it myself, but the dash show 19 for my wifes daily driving... which is 25% city - 75% freeway. When my wifes commute was 50/50 city/freeway the dash would show high 17's/low 18's. She has a much heavier foot than I... both on go and woah.
On road trips it routinely shows 19-22 (usually mid/high 20's)... depending on whether I'm driving responsibly at 70-75 or trying to "make time" driving at 85 and passing with authority.
 
#30 ·
I get about 16 in mixed conditions with regular 87.
Got as high as 19.5 on a 650 mile trip, and I was not driving gently...
Seen as low as 13 in punishing, dense urban driving.
And I have the 5 speed tranny (faux 6 speed). 8 speed would be better but I'm good with it.
 
#33 ·
My disclaimer, I only go by the onboard computer's figures. Having said that, and also mention that I run 91 octane, non-ethanol fuel, I average around 13.5 MPG city, and 23-24 MPG highway, with my '15 GC Limited, with the Hemi, and also equipped with the ORA II pack. I think if I had the "spring" suspension, and had the overall height down a little more, the highway MPG might improve.
 
#34 ·
My disclaimer, I only go by the onboard computer's figures..
I'm gonna check my onboard computer and see what it says - I haven't looked at it in a very long time as last I compared it was optimistic to say the least. 23-24 MPG highway in a 4x4 with Hemi I have never even gotten close but then again I don't drive with MPG in mind. :D
 
#35 ·
Solid 20mpg for my two trips to/from central Florida in the past month to deal with the 'rents medical issues. My EVIC remains accurate to manual calculation.
 
#36 ·
I have 2200 miles on my 17 Trailhawk Hemi and I've been a averaging 14 around town. I took it on a 500 mile round trip today, pretty much all highway from north jersey to Boston, with pockets of traffic here and there, averaged 19.1 for the day


Sent from my iPad using JeepGarage
 
#38 ·
11.6 MPG - mostly city type driving. I haven't reset this in at least 10,000 miles if not 15,000 miles.
 

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#42 ·
MPG counter does not keep cumulative track of all mileage whether you reset or not, meaning, 11.6 MPG is not your average for 10,000+ miles since your last reset... that MPG is maybe only the last 1,000 miles, if that.

I find it quite interesting that the Hemi will get 20-22 MPG on the interstate. I have the V6 and will get maybe 22 on the interstate. Right now it says 17.6. That is a mix of city and hi-way and is pretty typical. The V6 is not that much better than the hemi for fuel consumption if at all. Unless you drive city all the time. I have owned my 2011 Laredo X since new and the best I ever got was 23mpg and that was a long drive to Florida at 65mph. If you guys with the hemi break 20mpg consider yourself fortunate IMO. I really wanted the hemi when I bought mine but was afraid of poor fuel mileage. But the V6 is pretty poor IMO. I still wish I got the hemi. Oh well. Maybe next time.
8-speed trans helps a lot, as does driving habits (especially cruising speed).
 
#39 ·
I find it quite interesting that the Hemi will get 20-22 MPG on the interstate. I have the V6 and will get maybe 22 on the interstate. Right now it says 17.6. That is a mix of city and hi-way and is pretty typical. The V6 is not that much better than the hemi for fuel consumption if at all. Unless you drive city all the time. I have owned my 2011 Laredo X since new and the best I ever got was 23mpg and that was a long drive to Florida at 65mph. If you guys with the hemi break 20mpg consider yourself fortunate IMO. I really wanted the hemi when I bought mine but was afraid of poor fuel mileage. But the V6 is pretty poor IMO. I still wish I got the hemi. Oh well. Maybe next time.
 
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