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Old 08-14-2014, 11:22 AM
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Hit 17,000 miles and dramatic mileage increase

We live at 2,100 feet and pretty much everywhere we go is either up or down. For much of the time I have driven my 2014 Overland V6, the average milage has been 18-19 mpg and longer road trips have been around 22 mpg.

After 17,000 miles or so, I have noticed those milage numbers increase to 22 and 25 respectively. The most recent 25 average came on a trip from the Sierra foothills to the San Francisco area and back. A fair amount of each leg involved congested traffic through Sacramento (highway construction) and between SF and Burlingame.

Some engines seem to come into their own at certain milage totals. Looks like mine needed 17,000.
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Old 08-14-2014, 05:05 PM
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Re: Hit 17,000 miles and dramatic mileage increase

Is your fuel the same? I went through similar drill with my older truck. All of the sudden I was getting great mpg. Turns out the gas station had 0% ethanol gas (usually it is 10%). Apparently my old car (2001) was not to happy about ethanol. Unfortunatelly most gas stations, if not all. have 10-15% ethanol mix.


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Old 08-14-2014, 05:17 PM
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Re: Hit 17,000 miles and dramatic mileage increase

I am not that surprised that at sea level, your fuel economy is better. I bet you probably liked the added power that came with lower altitudes. While I generally agree that it takes engines thousands of miles to be broken in, you are likely observing the cumulative effect of a variety of factors.
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Old 08-14-2014, 06:59 PM
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Re: Hit 17,000 miles and dramatic mileage increase

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Originally Posted by Roki303 View Post
Is your fuel the same? I went through similar drill with my older truck. All of the sudden I was getting great mpg. Turns out the gas station had 0% ethanol gas (usually it is 10%). Apparently my old car (2001) was not to happy about ethanol. Unfortunatelly most gas stations, if not all. have 10-15% ethanol mix.


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Most fuel in California doesn't change with the seasons. It's hard to find non ethanol stations. So, in my case, the fuel is a constant.
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Old 08-14-2014, 07:01 PM
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Re: Hit 17,000 miles and dramatic mileage increase

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Originally Posted by f1anatic View Post
I am not that surprised that at sea level, your fuel economy is better. I bet you probably liked the added power that came with lower altitudes. While I generally agree that it takes engines thousands of miles to be broken in, you are likely observing the cumulative effect of a variety of factors.
I agree that there are other factors at play. I guess I might have emphasized the trip to SF, but the increase in mileage has maintained for the last two tanks, at least. Whatever it is, I like it.
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Old 08-16-2014, 01:56 AM
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Re: Hit 17,000 miles and dramatic mileage increase

Which engine? v6?
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Old 08-16-2014, 07:27 AM
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Re: Hit 17,000 miles and dramatic mileage increase

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Which engine? v6?
Yep, it is the V6.
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Old 08-16-2014, 07:39 AM
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Re: Hit 17,000 miles and dramatic mileage increase

Greetings,

It was almost 10k when i felt the V6 finally break in. I did notice when I switched over to my recent AT tires, the gas milage has gone up from 1.5 to 2 mpg. I am now back to the posted rating of 22 mpg when I avg 75-80 mph on flat and light incline highway roads. I have hit 23.5 at 65 mph.

Back in January of 2011, I was a little worried about this engine from the early reviews. This engine turned out to a real sleepier.

Best for now.
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Old 08-16-2014, 10:47 AM
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Re: Hit 17,000 miles and dramatic mileage increase

How old is your oil? Some oils will thin as they age and your mileage can go up.

Tire pressure, oil, season can have a lot of influence over MPG.
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Old 08-16-2014, 11:12 AM
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Re: Hit 17,000 miles and dramatic mileage increase

Quote:
Originally Posted by mswlogo View Post
How old is your oil? Some oils will thin as they age and your mileage can go up.

Tire pressure, oil, season can have a lot of influence over MPG.
Greetings,

Since, I have the JGC, the oil gets change at 6K. I forgot which oil my Jeep Service center uses. For tire pressure the fronts are set at 38 and the rear is 36 psi. The tires have nitrogen in them.

The mpg that I have posted is based on the summer blend of gas. The winter blend in my area i always lose mpg. Their is a great thread on the general Wk2 forum that explains the use of the various stages of Ethanol and the pros & cons of the flex fuel as well. These threads also explain the cause & effects of mpg. Here is one of them:

Should I use REC 90 gas in my V8?

Even through this tread is deals mainly with the V8 Hemi, the basics remain the same for the V6 also.

Best for now.
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Old 08-17-2014, 11:38 AM
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Re: Hit 17,000 miles and dramatic mileage increase

OP, are you tracking your miles per tank and hand calculating for your MPG, or just using the readings from the computer?

FWIW, in my experience of buying new cars over the last 20 years, all of my vehicles didn't improve in mileage after about the first tank of gas. First tank would be a little lower than EPA estimates, and after the first fill up, mileage pretty much stabilized and never got better. It certainly shouldn't take a modern gasoline engine 17k miles to break in. Diesel engines apparently take a little longer to break in, but I wouldn't know as I've never owned a diesel.
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