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Old 12-29-2014, 09:23 AM
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Low Gas Mileage

I have a '14 JGC Limited w/ 20" wheels. I have about 67XX miles on the jeep and had the first oil change done about 2 months ago. I noticed that after the oil change, my MPG dropped from about 19 to just under 17. Most of my driving is done in a suburban area.

At first I thought maybe it was the way I was driving. When I first got the Jeep I was babying her and as time went on I started driving normal. But normal is rarely taking the RPM's past 3k.

From what I have read so far, its seems like 19MPG is what people are getting in the city. Is my drop in MPG normal or should I be concerned? Any things I can look for to improve mpg?

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  #2  
Old 12-29-2014, 09:27 AM
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Re: Low Gas Mileage

If you live in a colder area, the winter formula fuels can and do cause that kind of mileage drop. Annually. Nature of the beast. My "winter drop" is typically about 1.5-2 mpg for general rural driving and a bit less of a drop for highway on long runs.

I cannot think of anything related to an oil change that would affect milage like that.
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Old 12-29-2014, 09:44 AM
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Re: Low Gas Mileage

Quote:
Originally Posted by akim1220 View Post
I have a '14 JGC Limited w/ 20" wheels. I have about 67XX miles on the jeep and had the first oil change done about 2 months ago. I noticed that after the oil change, my MPG dropped from about 19 to just under 17. Most of my driving is done in a suburban area.

At first I thought maybe it was the way I was driving. When I first got the Jeep I was babying her and as time went on I started driving normal. But normal is rarely taking the RPM's past 3k.

From what I have read so far, its seems like 19MPG is what people are getting in the city. Is my drop in MPG normal or should I be concerned? Any things I can look for to improve mpg?
I assume you're referring to the 3.6L engine? In 4X4 configuration it's rated at 17 city, 24 highway and 19 combined for reference.

I have a 50 mile round trip commute to work which works out to about 30 miles of 2 and 4 lane highway and 20 miles of stop'n go city driving. I've never checked mine for pure highway mileage but I run a combined average of around 20.4 in warm weather. This will drop to around 18 in cold weather... even lower when temps are sub-zero and/or 4WD is engaged on slippery roads.

I'm not aware of any cold weather change made to the blend of gasoline (for diesel there is) and I can't see how an oil change would negatively affect fuel economy. If it's cold and/or snowy where you are then I'd chalk your drop in mileage up to that.

If you aren't already using it, give Eco mode a try. See if that helps. On mine it makes a positive difference in fuel economy.
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Old 12-29-2014, 10:22 AM
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Re: Low Gas Mileage

Quote:
Originally Posted by MDBones View Post
I assume you're referring to the 3.6L engine? In 4X4 configuration it's rated at 17 city, 24 highway and 19 combined for reference.

I have a 50 mile round trip commute to work which works out to about 30 miles of 2 and 4 lane highway and 20 miles of stop'n go city driving. I've never checked mine for pure highway mileage but I run a combined average of around 20.4 in warm weather. This will drop to around 18 in cold weather... even lower when temps are sub-zero and/or 4WD is engaged on slippery roads.

I'm not aware of any cold weather change made to the blend of gasoline (for diesel there is) and I can't see how an oil change would negatively affect fuel economy. If it's cold and/or snowy where you are then I'd chalk your drop in mileage up to that.

If you aren't already using it, give Eco mode a try. See if that helps. On mine it makes a positive difference in fuel economy.
Thanks guys. Didn't realize we lose a couple MPG's in cold weather. I also mistook 19mpg as the rated city mpg instead of combined.
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Old 12-29-2014, 11:54 AM
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Re: Low Gas Mileage

I'm not too thrilled with our MPG in the '13 Trailhawk with the Hemi. We have about 11k on the clock now.

12 MPG city seems awful low in the city.

I used to get an honest 15 MPG with my '03 Hemi truck.
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Old 12-29-2014, 12:26 PM
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Re: Low Gas Mileage

To increase the vapour pressure in colder climates winter blend gasoline contains more butane than summer blends. More butane means lower energy content which is one reason why gas mileage is typically lower in winter.
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Old 12-29-2014, 01:33 PM
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Re: Low Gas Mileage

I get an average of 17 mpg with the Hemi. It drops to 15.x when I'm doing all city. Goes up to almost 21 when its all hwy.
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Old 12-29-2014, 06:07 PM
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Re: Low Gas Mileage

Keep in mind oil does lose some viscosity over time and when you put fresh oil in it can sometimes drop MPG a tad.


I'd also verify exactly what oil they put in. It can make a significant difference.
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Old 12-31-2014, 09:09 AM
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Re: Low Gas Mileage

Using synthetic oil, I average about 19 mpg in mixed driving in the Winter, and 21 mpg during the Summer in my 2014 Overland V6 4x4...according to the dash mpg readout. That's with 87 octane fuel and an aftermarket CAI.
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