Fueleconomy calculator - JeepForum.com
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post #1 of 9 Old 05-13-2013, 05:22 PM Thread Starter
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Fueleconomy calculator

I have a bit over 10,000 miles on my '12 Limited. I have never reset the fuel economy calculator, or trip mileage. So I thought that the fuel economy it was showing me was all time since I acquired the vehicle. That showed 17.0. Most of my driving is local. I just got back from a 1,000 mile trip, most of which was on highways and Interstates. My economy now shows as 21.3. I guess I find it hard to believe that one 1,000 mile trip can improve all time economy by that much.

Was the 17 mpg before the trip really the average number since I first got the vehicle? Should one highway trip make that much of a difference?

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post #2 of 9 Old 05-13-2013, 05:46 PM
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Sounds about right... They might have a limited interval for these calculations.
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post #3 of 9 Old 05-14-2013, 04:22 AM
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Apparently, not a true running average. It does sound more like a limited interval.

Average was 17 MPG, now 21.3 might be calculated as follows:

Let's say your 1000 mile highway trip averaged 25 MPG: 25 + 17 = 42 divided by 2 + 21 MPG.

This is only a wild guess since I have no clue how the running average actually works.
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post #4 of 9 Old 05-14-2013, 07:49 AM
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As folks have mentioned, the fuel economy display is a running average with a "window" of x miles. So yes, a 1000 mile highway trip will get you to where you are more-or-less showing what your highway mileage was since the "window" is undoubtedly lower than 1000 miles in my experience. The accuracy can vary slightly from "real" hard-measured fuel economy, depending on how you drive. I have a light foot and my EVIC mileage has actually been pretty close to "real" based on my spot checks using a calculator and fuel recepts. I'm also showing 17 for my general rural driving right now; slightly higher than it was because with the milder weather, I'm running with the HVAC on manual with just outside air blowing in. Highway, I get about 20-21 manually calculated as well as via the EVIC.

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post #5 of 9 Old 05-14-2013, 08:49 AM
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I had a similar experience.

I think your numbers are reasonably accurate.
I just did a road trip from Toronto Canada to Lawrence Indiana USA.
EVIC read 12 MPG at start of the trip and 23 MPG at the end. I stopped 3 times along the way.
Did the same trip in the wife's 2 door, 2 liter Hyundai had almost the same numbers
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post #6 of 9 Old 05-14-2013, 11:17 AM
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Sounds right to me. On a 2600 miles round trip from Houston to Durango, I went from 17 MPG in Houston to 22.5 once I hit Dallas a few hours after leaving.

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post #7 of 9 Old 05-14-2013, 11:45 AM
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I reset mine every tank...always have for every vehicles that has had this feature.
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post #8 of 9 Old 05-14-2013, 01:21 PM
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Originally Posted by kkreit01 View Post
I reset mine every tank...always have for every vehicles that has had this feature.
I like Swiss cheese, but the price keeps going up.
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post #9 of 9 Old 05-15-2013, 06:07 AM
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The MPG will creep up and I would think that a 1000 mile trip would be far enough to raise it to 21 mpg. I know that when on the hwy driving the speed limit or a little above and not passing a lot I will always get 24+ mpg (V6) and around town I get between 18 & 21. I think the GC gets pretty good mileage considering what you are driving. There are a lot of lesser vehicles out there that don't get all that much better mileage!
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