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  #277  
Old 04-09-2016, 05:50 PM
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Re: For those who drive a Hemi 5.7

Can owners post more MPG numbers?

Seems like overall 14-15 MPG is about average? Not heavy foot but not light foot...mix freeway/inside driving...

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  #278  
Old 04-09-2016, 06:04 PM
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Re: For those who drive a Hemi 5.7

Quote:
Originally Posted by Action View Post
Can owners post more MPG numbers?

Seems like overall 14-15 MPG is about average? Not heavy foot but not light foot...mix freeway/inside driving...
If I light foot mixed I average around 19.5, normal driving mixed around 18. I don't get down to 14-15 unless I heavy foot sport mode.

Usually just 87 octane....
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  #279  
Old 04-09-2016, 06:09 PM
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Re: For those who drive a Hemi 5.7

Quote:
Originally Posted by Action View Post
Can owners post more MPG numbers?

Seems like overall 14-15 MPG is about average? Not heavy foot but not light foot...mix freeway/inside driving...

14 on the only tank I have recorded it on with 89. That was with 1/3 on highway and rest around town. We will see what I get with 93 with similar conditions.


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  #280  
Old 04-09-2016, 06:49 PM
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Re: For those who drive a Hemi 5.7

My 2014 Summit V8 averaged 16.4mpg over the time I owned it. That was no highway, but pretty easy far suburban miles, and typically driving as light footed as I could. This was using my fuely app and logged 19 tanks since new. My best recorded tank was 17.7mpg. That's pretty much as good as it's gonna get unless you're in the open country and get to be on a highway atleast a little. Through the winter it would be down in the 15mpg range.
Basically to sum it up, the window stickers epa ratings are very accurate. Even though I loved the V8, it's nice to be in my V6 and seeing above 20mpg with the exact same commuting.
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  #281  
Old 04-09-2016, 07:21 PM
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Re: For those who drive a Hemi 5.7

Quote:
Originally Posted by Action View Post
Can owners post more MPG numbers?

Seems like overall 14-15 MPG is about average? Not heavy foot but not light foot...mix freeway/inside driving...
Tons of threads about this.

I average about 16 mpg in general rural driving during the warmer months and 20-22 on the highway during the same time period. I get 1-2 mpg less during colder weather.
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  #282  
Old 04-10-2016, 04:38 PM
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Re: For those who drive a Hemi 5.7

I'm getting around 14-15mpg but that's with no highway driving, all country roads.
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  #283  
Old 04-10-2016, 04:51 PM
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Re: For those who drive a Hemi 5.7

I added a hypertech and a volant CAI to my jeep and I am averaging 17 just city driving. On the highway I am fluctuating between 22 and 23. Not sure what it got stock as I added it right away for some of my mods. When I say it is average 17 city it goes between 16.8 and 17.2 so 17 becomes the average.

This is doing the speed limit in town so not a heavy foot , and your average amount of start and stop at red lights , etc. On the highway I don't drive very heavy footed , doing about an average of 10 over , so most highway driving is 80 mph.
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  #284  
Old 04-10-2016, 06:18 PM
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Re: For those who drive a Hemi 5.7

Quote:
Originally Posted by Action View Post
Can owners post more MPG numbers?

Seems like overall 14-15 MPG is about average? Not heavy foot but not light foot...mix freeway/inside driving...
That was after a 500 mile highway trip from a couple of weeks ago. But the average, (21.5), is from when I brought it home a year ago. I've run nothing but 91 Premium in it since I bought it. Since the trip it's gone down to just under 19 with a bit less than 3,000 miles. For a 360 H.P. V-8, I can't complain about the mileage at all.

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Old 04-10-2016, 06:22 PM
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Re: For those who drive a Hemi 5.7

Quote:
Originally Posted by Action View Post
Can owners post more MPG numbers?

Seems like overall 14-15 MPG is about average? Not heavy foot but not light foot...mix freeway/inside driving...
I do a mix of city and highway and my mixed mileage on the v8 is around 18 (87 octane) and on a highway cruise only its usually around 23 sometimes a little more sometimes a little less just depends on the speed you set, speeds below 70 the MDS stays on a good bit more than speeds over 70 which is how you can end up with some lofty numbers for a highway only cruise on the v8. I have had 24-25 mpg trips before if you keep the speeds down around 65 but I would not consider that an average.

You will see everything under the sun for mpg numbers probably between 10-25 mpg. With 1000 people you will have 1000 different driving styles and 1000 different answers. Car and Driver did instermented tests on a 2014 v8 and v6 and produced 16 mixed on the v8 and 17 mixed on the v6, the v6 having to work harder to move around the heavy suv is the reason they gave. I'm sure the newer v6 with the stop start will increase that gap over the old 14-15 v6 but I have not seen any real world instermented numbers on it yet. the mixed 4x4 epa number differences were 3 mpg and I think 4 for the 2016+ if I remember right. the majority of americans probably tend to be more heavy footed than light footed always rushing around clicking on phones like crazy people and why you get a mixed bag with some engines not meeting epa estimates. but remember its all in the driver the engines are all the samething so you need to try them out for your specific situation because guaranteed you wont come up with the same thing as someone else. with gas prices where they are I would not ge too focused on a few mpg here or there its a 5300lbs suv you are not going to get stellar mileage no matter what. consider that up front cost imo that's really where you need to decide if you want that bigger engine or not. the v8 is more of a want than a need unless you plan on towing near limits then you could make a case for need.

One thing to consider also is that compared to other SUVs that offer v8s the GC V8 is a pretty cheap upgrade. When I bought my 2014 GC summit I paid $2350 ($2695 MSRP) to upgrade to the v8, not only was that the engine itself but also included, heavier duty 8HP70 transmission, Quadra DriveII with ELSD, bigger heavier duty axles, heavy duty brakes, heavier duty radiator and fan. and the 240lbs that the engine and all that upgraded equipment adds is a little extra but really not that much for all that stuff.

The $2350 ($2695 MSRP)price for the v8 has gone up from what I paid for my 2014 but still not too terrible of a price for what all you get. you just have to decide if its something you want or care about for your situation some people could care less about extra power so the v8 is definitely not for them but if you are some one that does care about it the few $k for the upgrade is well spent. For me I never even thought about not getting it and actually wish the 6.4 had been offered on the summit lol but buy what you like, like what you drive. If you are on the fence deciding then get it because 50k is too much money to be spending to sit around wishing you had got it a few months from now IMO.
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  #286  
Old 04-10-2016, 06:44 PM
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Re: For those who drive a Hemi 5.7

Quote:
Originally Posted by silvermax04 View Post
I do a mix of city and highway and my mixed mileage on the v8 is around 18 (87 octane) and on a highway cruise only its usually around 23 sometimes a little more sometimes a little less just depends on the speed you set, speeds below 70 the MDS stays on a good bit more than speeds over 70 which is how you can end up with some lofty numbers for a highway only cruise on the v8. I have had 24-25 mpg trips before if you keep the speeds down around 65 but I would not consider that an average.

You will see everything under the sun for mpg numbers probably between 10-25 mpg. With 1000 people you will have 1000 different driving styles and 1000 different answers. Car and Driver did instermented tests on a 2014 v8 and v6 and produced 16 mixed on the v8 and 17 mixed on the v6, the v6 having to work harder to move around the heavy suv is the reason they gave. I'm sure the newer v6 with the stop start will increase that gap over the old 14-15 v6 but I have not seen any real world instermented numbers on it yet. the mixed 4x4 epa number differences were 3 mpg and I think 4 for the 2016+ if I remember right. the majority of americans probably tend to be more heavy footed than light footed always rushing around clicking on phones like crazy people and why you get a mixed bag with some engines not meeting epa estimates. but remember its all in the driver the engines are all the samething so you need to try them out for your specific situation because guaranteed you wont come up with the same thing as someone else. with gas prices where they are I would not ge too focused on a few mpg here or there its a 5300lbs suv you are not going to get stellar mileage no matter what. consider that up front cost imo that's really where you need to decide if you want that bigger engine or not. the v8 is more of a want than a need unless you plan on towing near limits then you could make a case for need.

One thing to consider also is that compared to other SUVs that offer v8s the GC V8 is a pretty cheap upgrade. When I bought my 2014 GC summit I paid $2350 ($2695 MSRP) to upgrade to the v8, not only was that the engine itself but also included, heavier duty 8HP70 transmission, Quadra DriveII with ELSD, bigger heavier duty axles, heavy duty brakes, heavier duty radiator and fan. and the 240lbs that the engine and all that upgraded equipment adds is a little extra but really not that much for all that stuff.

The $2350 ($2695 MSRP)price for the v8 has gone up from what I paid for my 2014 but still not too terrible of a price for what all you get. you just have to decide if its something you want or care about for your situation some people could care less about extra power so the v8 is definitely not for them but if you are some one that does care about it the few $k for the upgrade is well spent. For me I never even thought about not getting it and actually wish the 6.4 had been offered on the summit lol but buy what you like, like what you drive. If you are on the fence deciding then get it because 50k is too much money to be spending to sit around wishing you had got it a few months from now IMO.
Great post.

Not considering the v6 at all. Either the Hemi 5.7 or SRT ... or just an entirely different car.

Just wanted to see what the gas mileage numbers were to calculate long term costs.

Obviously it's a rough $ estimate considering gas prices can change - but I don't see it moving too crazy in this current global climate + electrical and economical car sales rising + cars becoming more efficient.

I test drove the SRT and the v6 - haven't test drove the 5.7 yet.

However that SRT MPG is atrocious from what I've seen. + about $15k - $20k more for the car.
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  #287  
Old 04-10-2016, 07:05 PM
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Re: For those who drive a Hemi 5.7

Just a note since we are on mpg's, for those that go based off the dashes mpg readings, that is not 100% accurate. You need to hand calculate or use one of those cool apps (love my fuely app) to get the right number. The Grand Cherokees dash will show 1-1.5mpg more than its actually getting. This applies to both the V6 and V8 and its been a consistent trend in all three of my WK2's. As an example my last tank on my '15 High Altitude V6 showed 21.3 at time of fillup. That tanks actual mpg was 20.3mpg. Thats assuming resetting it at each fillup only.
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  #288  
Old 04-10-2016, 07:14 PM
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Re: For those who drive a Hemi 5.7

Unfortunately, both my trucks are V8s so I get bad gas mileage in everything. The good part is that I drive a company vehicle to and from work which is a Ford Fusion Hybrid, so the gas mileage on my trucks don't matter!! I love my V8s! After commuting back and forth in that Fusion, I look forward to them.
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