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  #37  
Old 07-22-2014, 09:41 PM
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Re: Eco Button Impact on Performance?

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Originally Posted by Willx View Post
Comparing performance on a test drive that random people at the dealership have possibly tromped on is not a great comparison but cannot be helped either. I personally find my JGC Diesel smoother shifting and certainly more powerful than my 2009 ML320 which walked a few VWs.

The truck adapts very nicely to driving style and power wise really opens up after 5000 miles.
This is good to know. Looks like I might have to decide a little more quickly on which vehicle I will be purchasing so I will be trying to get to the dealership in the next day or so to test drive again before final decision and purchase.
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  #38  
Old 07-23-2014, 03:23 PM
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Re: Eco Button Impact on Performance?

Additional Fuel Economy information:

Did the round trip up 95 (and beyond) from WPB Florida to Vermont (~2500 miles total) a month back - 2 days up, 1 day bumbling about, 2 days back. Whole trip, including bumbling about, averaged around 31 mpg (by EVIC of course). Normally went 70-75 when I could; DC and NYC saw hours of stop and go. Cruise control whenever possible. During the trip, there were 3 occasions where the "miles traveled on the tank" + "miles 'til empty" > 900. Almost took a pic, but I figured that would make me weird...
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  #39  
Old 07-23-2014, 03:48 PM
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Re: Eco Button Impact on Performance?

If you aren't already aware, the EVIC uses a rolling average over the past 300 miles (or less, if you reset it). So that 31 MPG was only for the last 300 miles of your trip, not all 2500. If you want to track mileage over larger intervals you have to do it manually. I recommend Fuelly.com because they make entering your fill-ups pretty painless from a mobile browser or in batch via a CSV file.
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  #40  
Old 07-24-2014, 07:24 AM
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Re: Eco Button Impact on Performance?

So, I test drove the vehicle again last night and I started out with the Eco button off. I don't know if it was the button or what but I thought the vehicle drove much nicer yesterday then it did a couple days ago. I reset the trip computer leaving the dealers lot and was able to turn 28.5 mpg with a pretty good drive down the interstate and some downtown city driving with some idling in there while looking the vehicle over. Pretty pleased with that.

That said I think the Eco Button does make a small difference.
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  #41  
Old 07-24-2014, 08:51 AM
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Re: Eco Button Impact on Performance?

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Originally Posted by Rumline View Post
If you aren't already aware, the EVIC uses a rolling average over the past 300 miles (or less, if you reset it). So that 31 MPG was only for the last 300 miles of your trip, not all 2500. If you want to track mileage over larger intervals you have to do it manually. I recommend Fuelly.com because they make entering your fill-ups pretty painless from a mobile browser or in batch via a CSV file.
I was aware. I am old school - I keep a fuel log in the vehicle...31MPG over the entire trip. One fill was over 33, another under 30, with a few more in between (attempted to fill wherever fuel was cheapest, not necessarily when I was empty).
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  #42  
Old 07-24-2014, 03:03 PM
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Re: Eco Button Impact on Performance?

Oh ok, I was going by what you said here:
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Originally Posted by adw_tdi View Post
Whole trip, including bumbling about, averaged around 31 mpg (by EVIC of course).
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  #43  
Old 07-28-2014, 08:25 PM
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Re: Eco Button Impact on Performance?

Quote:
Originally Posted by Rumline View Post
If you aren't already aware, the EVIC uses a rolling average over the past 300 miles (or less, if you reset it). So that 31 MPG was only for the last 300 miles of your trip, not all 2500. If you want to track mileage over larger intervals you have to do it manually. I recommend Fuelly.com because they make entering your fill-ups pretty painless from a mobile browser or in batch via a CSV file.
Are you sure about this. I believe the average is since the last reset. The 300 miles you are speaking about is in regards to reading of miles left till empty.
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  #44  
Old 07-28-2014, 08:50 PM
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Re: Eco Button Impact on Performance?

I bit off topic but I considered the Touareg Diesel V6TDi and took it home for the night. Strong engine and smooth shifting but I couldn't get over the pleather seats and the almost monochrome control centre display which wasn't too intuitive. The Dynaudio upgrade as well as the Pano Roof and Tech Package (blind spot, adaptive...) options pushed the price up to V8 R-Line area ($120k in Oz). Plus salesmen playing sillybuggers.

Grand Cherokee is the bargain of the century.
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  #45  
Old 07-28-2014, 10:22 PM
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Re: Eco Button Impact on Performance?

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Originally Posted by Shannon View Post
Are you sure about this. I believe the average is since the last reset. The 300 miles you are speaking about is in regards to reading of miles left till empty.
Positive. The EVIC is very accurate but it is definitely a rolling average. If your driving style varies from the first half of a tank full to the last half, you will notice the hand calculation won't agree with the EVIC.

I drove 250 almost all city heavy traffic miles during Christmas last year for half a tank then took a 350 mile highway trip. My EVIC showed 23 during the city then 32 after the trip. My hand calc was off by 4 mpg. On other occasions where the whole tank was same driving style, the EVIC agreed with my hand calc within 0.5 mpg.

Another way to "prove" the rolling average is to reset Trip B but not Trip A then drive. After 300 miles, they will both agree.

This has been discussed and proven by RAM owners as well.
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  #46  
Old 07-29-2014, 07:01 AM
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Re: Eco Button Impact on Performance?

My EVIC is currently tracking 24.6MPG, but as you can see from my Fuelly what I am actually getting. I have had several long highway trips recently which have helped bump up my MPG on that EVIC.
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  #47  
Old 07-30-2014, 07:46 PM
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Re: Eco Button Impact on Performance?

Quote:
Originally Posted by ExcursionDiesel View Post
Positive. The EVIC is very accurate but it is definitely a rolling average. If your driving style varies from the first half of a tank full to the last half, you will notice the hand calculation won't agree with the EVIC.

I drove 250 almost all city heavy traffic miles during Christmas last year for half a tank then took a 350 mile highway trip. My EVIC showed 23 during the city then 32 after the trip. My hand calc was off by 4 mpg. On other occasions where the whole tank was same driving style, the EVIC agreed with my hand calc within 0.5 mpg.

Another way to "prove" the rolling average is to reset Trip B but not Trip A then drive. After 300 miles, they will both agree.

This has been discussed and proven by RAM owners as well.
This man speaks truth. A Chrysler engineer confirmed this over on the TDR and as mentioned above it is easy enough to see in the car itself if you're paying attention. This is one of the reasons not to use the EVIC for absolute mileage numbers which should be calculated at the pump. The other is that the computer also keeps track of your driving style and conditions (mostly freeway or city, average speeds, average actual mileage etc) and the EVIC then fudges the readout modestly in an attempt to give you a better mileage estimate based on the driving it "thinks" you are/will be doing.

This isn't necessarily a bad thing in either case because capping your average miles calculated means you will be showing something closer to what you are really doing now and of course in the case of the latter it is doing its best to give you decent numbers that will reflect actual use more than transitory low or high numbers that are not representative of your ongoing mileage.

When you think about it here on a car forum many people are more aware or interested in their mileage, enough so to keep track of it in an organized way and eventually notice these things. This isn't the case when looking at the public at large where these little bits of trickery will give them for the most part numbers that are likely to reflect actual mileage better. It would be preferable for rabid types like me to get the real numbers but I have to recognize that people like me are a small minority any more.

Grist for a different thread but related is there is all manner of trickery going on with all the gauges in cars nowadays as they show what the computer tells them to based on what the engineers want you to see. Temp, oil, all of them are dithered. I suspect from a few things I've read in this thread that some of you might not be aware of that.
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