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Unread 02-18-2013, 11:05 AM   #1
GershJeep
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Location: Seattle, WA
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MPG Question

Hello All,

I am 200 miles into my Overland and the MPG is reading about 11-12. In moderate driving, 50/50 city and hwy. (I know not the best indicator yet, but a good start)

Is there a certain break in period for the 5.7V8 to achieve better economy?
What does everyone else get with the HEMI?

I am planning on using regular 87 gas, the dealer advised this is the standard for the car, is everyone else filling up with regular?

Can someone recommend a good break-in procedure for this engine?

Thanks for the help.

RG

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Unread 02-18-2013, 11:09 AM   #2
webspoke
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That is not far from normal. In mostly city driving (with some fast highway) mine gets in the 11-15 range in my area on 87. Be sure to reset it in the EVIC with your next tank so that you don't have any of the dealer test drive miles logged in that. Ant time you have a lot of stp/start/accel the mileage really takes a hit. The motor is more efficient at a steady cruise.
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Unread 02-18-2013, 11:45 AM   #3
jim_in_PA
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While I don't do much "true city" driving, my rural everyday driving milage has been 15-16 mpg from the start and I get 20-21 on the highway. (Pretty consistent for both EVIC and manual calculations) I've never gotten that really low figure you're stating in the 12000 miles now on my Summit. BTW, I do use 87 octane. Jeep says 89 is preferred, but I can't see spending the extra money and since most of my gas gets bought at Costco...89 isn't even an option.
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Unread 02-18-2013, 02:44 PM   #4
SPL170db
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I blame the ethanol......it worthless, it's bad for your engine, and it gives worse mileage.
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Unread 02-18-2013, 03:11 PM   #5
barry1me
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we are still on our first tank of gas but we are sitting at around 14.7. We will see how it does. We are only going to run 89 octane.
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Unread 02-18-2013, 04:30 PM   #6
TheSiltSurfer
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I get 12-13mpg here in the mountains I have a 6 mile climb to our house everyday also. I run Premium fuel only, the 5.7 recommended octane is 89 which regular & Plus only offer 87 highest up here. so this is why I consistently run premium. Although when I travel home to Texas I get 16-18 highway with Eco kicking in.
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Unread 02-18-2013, 08:30 PM   #7
mountaineerfan
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I've been averaging 15.7 per tank of 87 around town with daily 40 mile interstate at 70-75. When using 89 it bumped up to 17.
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Unread 02-18-2013, 09:58 PM   #8
GershJeep
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Thanks everyone. I will play with different fuel grades and should have a better idea in a few thousand miles.
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Unread 02-19-2013, 12:58 AM   #9
loveracing1988
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Quote:
Originally Posted by SPL170db View Post
I blame the ethanol......it worthless, it's bad for your engine, and it gives worse mileage.
How exactly is it bad for your engine? I tell everyone the same thing, get some e85 and regular gas, get 2 metal bowls, put some in each of them and light them, see which one gives off more black smoke, that would be all of the carbon that accumulates in your engine.
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Unread 02-20-2013, 07:56 PM   #10
exl_ent_v6
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My gauge is showing between 10.6 and 11.0 mpg. I've been driving this vehicle so much nicer than my previous car just to try and get the mpg's up. I knew the Hemi would be bad on gas but I didn't think THIS bad. I probably would have bought something else knowing this...

BTW - 2013 Hemi with 600 miles... no bumper to bumper traffic just on/off highway for 10 miles each way.
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Unread 02-20-2013, 08:10 PM   #11
GershJeep
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Wow. That's not good. Dealer promised 16-17mpg combined. Fuelly was showing 15-16
I am at 12. I didn't think it would be that bad either. I might have gone for V6.
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Unread 02-20-2013, 09:58 PM   #12
pentastarguy
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i have the hemi in my 11 ram. some say if you turn the mds off you will get better mpg. i have not tried this as it makes no sense to me. i have found 0 difference in mpg or performence between 87 and 89 octane. all i can get in jersey is a 10% ethanol. i generally get between 15 and 17 mpg with rural driving, i have hit 20 mpg on extended hwy traveling. on some of the ram forums, it seems some hemi engines just get lousy mpg. no one knows why.
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Unread 02-21-2013, 02:01 AM   #13
Dave2002ti
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So called hemi

Quote:
Originally Posted by pentastarguy View Post
i have the hemi in my 11 ram. some say if you turn the mds off you will get better mpg. i have not tried this as it makes no sense to me. i have found 0 difference in mpg or performence between 87 and 89 octane. all i can get in jersey is a 10% ethanol. i generally get between 15 and 17 mpg with rural driving, i have hit 20 mpg on extended hwy traveling. on some of the ram forums, it seems some hemi engines just get lousy mpg. no one knows why.
Is heavy and is not a modern design. Chrysler really needs a modern V8 like the new GM small block or Ford Coyote. Ohv or ohc it really doesnt matter they just need something new that doesnt require a plug change every 32K miles. They could start with an aluminum block. And remember it aint a real hemi anyways!
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Unread 02-21-2013, 02:24 AM   #14
loveracing1988
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Quote:
Originally Posted by Dave2002ti View Post

Is heavy and is not a modern design. Chrysler really needs a modern V8 like the new GM small block or Ford Coyote. Ohv or ohc it really doesnt matter they just need something new that doesnt require a plug change every 32K miles. They could start with an aluminum block. And remember it aint a real hemi anyways!
Is that your signature because you out that in every post I have ever seen you make.
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Unread 02-21-2013, 06:42 AM   #15
JeepCares
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Quote:
Originally Posted by GershJeep View Post
Can someone recommend a good break-in procedure for this engine?
You're pretty much near the end of the break-in period for the 2013 WK V8 Hemi (from the 2013 WK Owner Manual)-
ENGINE BREAK-IN RECOMMENDATIONS
A long break-in period is not required for the engine and
drivetrain (transmission and axle) in your vehicle.
Drive moderately during the first 300 miles (500 km).
After the initial 60 miles (100 km), speeds up to 50 or
55 mph (80 or 90 km/h) are desirable.
While cruising, brief full-throttle acceleration within the
limits of local traffic laws contributes to a good break-in.
Wide-open throttle acceleration in low gear can be detrimental
and should be avoided.

Quote:
Originally Posted by GershJeep View Post
I am planning on using regular 87 gas, the dealer advised this is the standard for the car, is everyone else filling up with regular?
(from the 2013 WK Owner Manual)-
5.7L Engine -
This engine is designed to meet all emissions
regulations and provide satisfactory
fuel economy and performance when using
high-quality unleaded gasoline having
an octane range of 87 to 89. The manufacturer
recommends the use of 89 octane for optimum
performance. The use of premium gasoline is not recommended,
as it will not provide any benefit over regular
gasoline in these engines.
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