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  #13  
Old 09-03-2015, 09:36 AM
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Re: Awful Gas Mileage

I have a 2015 Overland v8. Less than 250 miles so far. I noticed the horrendous gas mileage. My commute is 9 miles one way in stop and go city traffic. Lots of stop signs and traffic lights. Car barely gets above 35 mph for more than a few seconds at a time.

The stop and go will drive the mpg down significantly. It takes a lot of energy to get a big truck moving and then by the time the engine is spooled up you are stopping again.

So far, I am averaging about 11 mpg.

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  #14  
Old 09-03-2015, 10:49 AM
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Re: Awful Gas Mileage

Yes, the type of driving makes all the difference in the world. Up here in the mountains there's lots of climbing but few stoplights. Still manage to average 16-17 overall with the V8.
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  #15  
Old 09-03-2015, 02:29 PM
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Re: Awful Gas Mileage

I just got back from a trip from VA to Ohio, mostly highway at 70-80, a fair amount of hilly roads, and some flat in Ohio. We were getting 25.4 mpg with the AC running. If you are only driving 5 miles at a time, you probably will get very low mileage. The engine burns a lot of gas until it warms up. Even in Orlando in the summer, it will take a few miles before it reaches operating temperature. I travel to Orlando a lot and use WAWA all the time. The stations are very busy, which means they turn over their gas a lot, so you're not likely to get bad gas. I think Top Tier is just a marketing gimmick. Even Costco gas is Top Tier. The major oil companies have mostly divested their refining business because it's low margin. So when you get Shell or Exxon, you're not getting Shell refined or Exxon refined gas. You're getting gas from a pipeline that serves an area. That has has to meet EPA standards for detergents and other additives to keep the engine clean. The companies have their own secret sauce that they put into the gas, but that doesn't mean much either. Read the article here:Is Cheap Gas Bad for Your Car? I think the best advice is from AAA S/CAL--get the cheapest gas that is closest to you. In Orlando that will be WAWA.
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  #16  
Old 09-04-2015, 08:51 AM
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Re: Awful Gas Mileage

So last night I did an experiment. I'm driving a 2015 v8 Overland.

Pretty much all of my driving so far has been on city streets (real city streets, not suburban) with a lot of stop and go. My morning commute is about 9 miles with a ton of stop signs and traffic lights. Constant stop and go. I've been averaging about 11 miles per gallon.

So last night I took the car out on the open highway for about 50 miles and reset the MPG. I averaged about 22 MPG doing about 65-75 mph over the trip. I don't think 25mpg or maybe a little more is unrealistic over a longer distance using cruise control.

I was watching the mpg readout and basically anytime you accelerate it drops dramatically. The motor drinks gas under acceleration but once moving seems to be pretty efficient.

When I'm in the city, when I take off from a stop light, the mpg gallon reading shows like 1-5 mpg! At first, I thought it was the gear indicator! Considering I barely get two blocks sometimes before having to stop again, the crappy 11 mpg seems accurate.

Compared to my V8 Touareg, this car is way more efficient on the open road as even on 500 mile road trips, my Touareg never saw more than 18mpg. In most cases it is around 15mpg. However, the city driving seems to be about the same.

The one thing I can't figure out is range though. The range indicator on the JGC shows like 250-275 mile range while the Touareg would give me a range of around 350 of hard city driving. 430 mile range on highway road trips. Touareg had a 22 gallon tank I believe. I don't know if the range indictor on the JGC is inaccurate but I can't believe there is that much of a difference between the two cars particularly when the JGC seems more efficient at speed and not too much worse in the city.
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  #17  
Old 09-04-2015, 11:09 AM
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Re: Awful Gas Mileage

I've got 1,028 miles, and I'm averaging 18.0 since I bought it. It's never been reset yet. And that's with a 5.7 HEMI. I burn mostly ARCO 91 Octane Premium. Here is what I've noticed. If you accelerate lightly, it allows the 8-Speed to upshift quicker. If you keep the RPM lower, mileage will improve substantially.

If you hold in a lot of throttle, the RPMS build. And it takes very little throttle to allow the engine into 3,000+ RPM range. And it will drink fuel if you do. You can kick it a bit away from the light, then back off and allow the transmission into higher gears more quickly, then continue with throttle....... But not enough to kick the trans back down.

It takes a little getting used to, but you'll be amazed at how much better your fuel mileage goes up. This is the first vehicle I've ever had with this "Instant MPG" feature. After working with it, I've changed my driving habits to get better mileage, and it's worked. And I don't drive like a Blue Hair on oxygen either.

Also, I believe without a doubt you get better mileage with Premium fuel. This because it allows the computer to run the engine with more spark advance, and that helps give you better fuel economy. It also allows for slightly better performance which translates to less throttle for the same acceleration. You can argue if the more costly Premium fuel is worth the mileage gain. That's up to you. I happen to think it is. I never thought I would be averaging 18.0 MPG in a big, heavy HEMI powered SUV, but the numbers don't lie. So my fuel / driving combination must have some merit. And I have yet to take a trip anywhere.
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  #18  
Old 09-04-2015, 11:50 AM
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Re: Awful Gas Mileage

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Originally Posted by makris0000 View Post
Hello

I've recently moved to Orlando for law school and I've noticed that lately I've been getting horrendous gas mileage. I only drive about 5 miles a day or so and I've been averaging 12-14MPG. Has anyone else been getting awful gas mileage? I have my tires filled to 38psi and I only have my bowling balls (about 35 pounds total, never made a difference in mpg in the past) and a golf club.

Also whenever I've had to do short trips I used to get about 17mpg back when my Jeep was newer and I would get around 21-22 on the highway. Also not sure if this or something like it was posted already.
I agree with the others that it is the short trips killing your mileage but just to eliminate them from the list of posibibilities check your PCV valve and your air filter to make sure they are clean.
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  #19  
Old 09-04-2015, 12:25 PM
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Re: Awful Gas Mileage

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Originally Posted by billt View Post
I've got 1,028 miles, and I'm averaging 18.0 since I bought it. It's never been reset yet. And that's with a 5.7 HEMI. I burn mostly ARCO 91 Octane Premium. Here is what I've noticed. If you accelerate lightly, it allows the 8-Speed to upshift quicker. If you keep the RPM lower, mileage will improve substantially.

If you hold in a lot of throttle, the RPMS build. And it takes very little throttle to allow the engine into 3,000+ RPM range. And it will drink fuel if you do. You can kick it a bit away from the light, then back off and allow the transmission into higher gears more quickly, then continue with throttle....... But not enough to kick the trans back down.

It takes a little getting used to, but you'll be amazed at how much better your fuel mileage goes up. This is the first vehicle I've ever had with this "Instant MPG" feature. After working with it, I've changed my driving habits to get better mileage, and it's worked. And I don't drive like a Blue Hair on oxygen either.

Also, I believe without a doubt you get better mileage with Premium fuel. This because it allows the computer to run the engine with more spark advance, and that helps give you better fuel economy. It also allows for slightly better performance which translates to less throttle for the same acceleration. You can argue if the more costly Premium fuel is worth the mileage gain. That's up to you. I happen to think it is. I never thought I would be averaging 18.0 MPG in a big, heavy HEMI powered SUV, but the numbers don't lie. So my fuel / driving combination must have some merit. And I have yet to take a trip anywhere.
I don't have much of a lead foot. I don't think I can baby it anymore off the line and actually get the car moving. This car is a tank and it takes a lot of horses to get her going. Unfortunately for me, my daily drive is stop sign, accelerate to maybe 30-35 then stop almost as soon as I get moving at another stop sign or traffic light.

The owner's manual says there is no benefit to running premium fuel. It does mention better performance from 87 to 89 though.

The best setup might be a hybrid where a high torque electric motor could handle starts and stops and then switch over to the gas once moving.
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  #20  
Old 09-04-2015, 12:42 PM
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Re: Awful Gas Mileage

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Originally Posted by Edumakated View Post
So last night I took the car out on the open highway for about 50 miles and reset the MPG. I averaged about 22 MPG doing about 65-75 mph over the trip. I don't think 25mpg or maybe a little more is unrealistic over a longer distance using cruise control.
If you want better gas mileage, cruise control is the last thing you should be using. Unlike the human that can see hills coming or other needs to give it some gas, the cruise control system waits until the speed starts to drop, then pretty much stomps on the gas to maintain speed. It's also more likely to drop down gears when it does that.

Your best mileage once you get to highway speed will be attained if you bump the truck into paddle mode and only downshift manually when you hit a hill that's too steep to maintain speed in the highest gear.

Cruise control is really only good for 3 things:

- If you set it at a speed where most cops won't pull you over, you're less likely to get a ticket by drifting over that speed on hills and curves.

- Cruise control reduces driver fatigue by allowing you to periodically shift your leg and foot positions, rather than having your right foot pinned to the same spot.

- Adaptive Cruise Control helps maintain a steady distance from traffic ahead of you.
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  #21  
Old 09-04-2015, 01:10 PM
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Re: Awful Gas Mileage

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Originally Posted by Edumakated View Post
So last night I did an experiment. I'm driving a 2015 v8 Overland.
Not sure if this will help you since I have a 6-speed, but I get about 13 in the city and 20-22 on the freeway but averaging the both together I get 16. However, I live in San Francisco where hills are like mountains and you need to stop at the end of every block. In the South Bay the lights are literally 5 minutes each so there's a lot of just sitting there on idle. I get about 350 miles before I fill up (8 - 10 hours of driving). However, if I just do freeway driving only I get about 430 miles.

The strange thing, though, is that once I got the TIPM recall done my mileage has been averaging about 17. It had dropped to 13 and 14 at times. So maybe that helped my gas flow? Anyway, since you have a 2015 model that shouldn't affect you.
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  #22  
Old 09-04-2015, 01:21 PM
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Re: Awful Gas Mileage

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Originally Posted by NetworkTV View Post
If you want better gas mileage, cruise control is the last thing you should be using. Unlike the human that can see hills coming or other needs to give it some gas, the cruise control system waits until the speed starts to drop, then pretty much stomps on the gas to maintain speed. It's also more likely to drop down gears when it does that.
There are a lot of hills on the freeway where I drive, especially a couple long grade that go on for a bit. I never had my Jeep on cruise control jam on the gas to maintain speed. It just does. HOWEVER, as a comparison, my 2015 Ford Fusion Hybrid mashes that throttle to maintain speed going up the same hills. That's when I just take it off cruise control and control the throttle myself.
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  #23  
Old 09-04-2015, 01:27 PM
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Re: Awful Gas Mileage

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Originally Posted by nathantw View Post
There are a lot of hills on the freeway where I drive, especially a couple long grade that go on for a bit. I never had my Jeep on cruise control jam on the gas to maintain speed. It just does. HOWEVER, as a comparison, my 2015 Ford Fusion Hybrid mashes that throttle to maintain speed going up the same hills. That's when I just take it off cruise control and control the throttle myself.
Well, the difference is, you have the V8. The V6 Jeeps absolutely get heavy on the gas when hitting hills in cruise mode.

It's not so much they're flooring it as they don't gently feather the gas peddle on like you would manually. Instead, it presses the peddle immediately to the position it thinks it needs to maintain speed.

That lack of finesse coupled with late response times means it uses far more gas on hills in cruise control mode.

I'll be rolling along in the mid to high 20's, when suddenly I'm in single digits when I hit a hill in cruise mode. When I use paddle mode and accelerate and shift down as needed manually, I stay in the double digits, even on hills.

The V6 gets better gas mileage under optimal conditions, but on hills, the difference between the V6 and the 8 starts to narrow because you're talking a lot of weight to haul. The V6 needs far more RPMs to generate anything close to the same power verses the V8.
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  #24  
Old 09-04-2015, 02:09 PM
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Re: Awful Gas Mileage

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Originally Posted by Edumakated View Post
So last night I did an experiment. I'm driving a 2015 v8 Overland.
The one thing I can't figure out is range though. The range indicator on the JGC shows like 250-275 mile range while the Touareg would give me a range of around 350 of hard city driving.
The range available will change based on both short term factors and the current overall average mpg based on the last 300-500 miles or so. When I do a fill-up and I'm doing highway miles (typically 20-21 mpg for me), my initial range after that fill-up is very often in the 480-500 mile range on the display. If I do a fill-up tomorrow (as I need to do) with my current average hovering at about 15 mpg because all my driving lately has been local and short, my full-tank range is going to come in at about 360 or so.
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