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  #13  
Old 04-22-2012, 12:51 PM
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Re: 2012 JGC gets 29 MPG??

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Originally Posted by Yadkin View Post
I'm a fairly economical driver and I average about 20.5 combined highway and city. Mine's 4WD. On rural two lanes, rolling country I can get 25. 5 over on the freeway 22 or 23.
How fast do you typically drive on the freeway?
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  #14  
Old 04-22-2012, 01:01 PM
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Re: 2012 JGC gets 29 MPG??

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How fast do you typically drive on the freeway?
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Originally Posted by Yadkin View Post
... 5 over on the freeway ....
Roads here are mainly 65. Some are 70.


If I drive ten over I'll get less than 21.
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  #15  
Old 04-22-2012, 02:17 PM
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Re: 2012 JGC gets 29 MPG??

If the EVIC is to be believed, on our free-flowing trip back from Charlotte last week, before we got into metro Philly we were getting 26.3 mpg typically going low-to-mid 70s with cruise control. That was using gas that the pump implied did not have 10% ethanol, which helped a bit.

Normally it's 3-6 mpg less on highway if you include stop-and-go suburban traffic leaving and arriving, plus traffic holdups and using 10% ethanol.
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  #16  
Old 04-22-2012, 03:13 PM
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Re: 2012 JGC gets 29 MPG??

It's believable, under the correct conditions.
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  #17  
Old 04-22-2012, 03:37 PM
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Re: 2012 JGC gets 29 MPG??

Do not use the EVIC as a way to add your gas mileage. The only true way to do it is using the old pen and paper way. The EVIC just gives a very loose estimate.
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  #18  
Old 04-22-2012, 03:44 PM
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Re: 2012 JGC gets 29 MPG??

I agree. The EVIC tends to give a slightly low number.
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Old 04-22-2012, 03:55 PM
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Re: 2012 JGC gets 29 MPG??

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Originally Posted by Knightrider03m View Post
Do not use the EVIC as a way to add your gas mileage. The only true way to do it is using the old pen and paper way. The EVIC just gives a very loose estimate.
Two things to give pause with EVIC numbers. First is the usual, plain old accuracy. But second, what are the reset parameters?

Our former '94 Limited's EVIC just kept computing until it was manually reset. If you hadn't reset it for 5k miles and went on a 1k trip, it would give mpg for the past 6k miles. Watch it long enough and this became apparent.

Not so with the WK2 EVIC, as is evident from the variance pattern of its readout. At some undefined point it recalculates, recombines or whatever, so in reality you can't tell a whole lot about what its numbers mean. The readout just yo-yos up and down with no apparent logic, although of course if we could hack into the code we could figure out what's going on.

Perhaps this should a Car Talk puzzler question?
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  #20  
Old 04-22-2012, 04:12 PM
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Re: 2012 JGC gets 29 MPG??

The magic word here is Cruise. Using Cruise control makes the Jeep unbeliveably fuel efficient.

And remember the V-6 runs on regular grade gas, so it has the capability to be a pretty cost efficient people mover.

The Hemi also benefits greatly from Cruise usage.
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  #21  
Old 04-22-2012, 06:06 PM
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Re: 2012 JGC gets 29 MPG??

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...At some undefined point it recalculates, recombines or whatever...
Wait, what? You mean it doesn't calc from the last reset only?
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Old 04-22-2012, 07:32 PM
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Re: 2012 JGC gets 29 MPG??

The EVIC seems to do a rolling average, weighting recent history more heavily than past history. I'd love to know the exact algorithm.
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  #23  
Old 04-22-2012, 07:57 PM
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Re: 2012 JGC gets 29 MPG??

I think it only does the average from last reset. However if you drive hard for a mile but great for 5 miles, the average will still show a huge dip in MPG vs what its true mileage is on a pen and paper.
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Old 04-22-2012, 07:58 PM
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Re: 2012 JGC gets 29 MPG??

Then you have thoses with the bigger wheels and tires which always show a messed up EVIC number.
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