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  #25  
Old 04-22-2012, 09:41 PM
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Re: 2012 JGC gets 29 MPG??

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Originally Posted by Knightrider03m View Post
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.

I totally agree with this. I can drive 150 (100% hwy) miles and hop off the freeway and step on it a couple times for 1mile and it will drop almost .5 mpg which is not possible.
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  #26  
Old 04-22-2012, 11:25 PM
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Re: 2012 JGC gets 29 MPG??

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Originally Posted by Yadkin View Post
Wait, what? You mean it doesn't calc from the last reset only?
Exactly, but what it does instead is a mystery. Is it a moving average, moving reset, short-term tweak of some sort, or what -- who knows, any of these or some combination or perhaps something else altogether. It would be nice if this were explained in the full-bore owner's manual.
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  #27  
Old 04-23-2012, 08:31 AM
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Re: 2012 JGC gets 29 MPG??

Long answer to above but got "Internal Server Error", will need to wait until after work but accoording to OM 5th pg 312, the DTE is a weighted average of the instantaneous and the average. Others are real. Question: Does "Empty" mean no gas or is there a reserve ?
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  #28  
Old 04-23-2012, 11:54 AM
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Re: 2012 JGC gets 29 MPG??

Have 31,000 miles on mine and just recently did a 180 mile one way trip with cruise set at 60 mph. Had to follow mother-in-law driving an RV and averaged 27.5 MPG, my usual average speed is 73 and I get 21-22 MPG. So if you can drive 60 MPH on the highway all the time I'd say it's absolutely possible.
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  #29  
Old 04-23-2012, 12:22 PM
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Re: 2012 JGC gets 29 MPG??

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Originally Posted by padgett View Post
Long answer to above but got "Internal Server Error", will need to wait until after work but accoording to OM 5th pg 312, the DTE is a weighted average of the instantaneous and the average. Others are real. Question: Does "Empty" mean no gas or is there a reserve ?
Good sleuthing, padgett, carrying the DTE algorithm over into MPG computation. The DTE info on p. 311 of the printed manual seems to fit with what we're seeing with MPG: "a weighted average of the instantaneous and average fuel economy". A great idea for DTE, but awful if, as it appears, this hybrid is carried over to MPG even if the manual almost implies otherwise. (If average fuel economy/MPG is combined with instantaneous fuel economy for DTE, then average fuel economy/MPG should not be a two-variable hybrid, but from actual use it very much appears to be. Presumably this concept was, perhaps inadvertently, carried over during coding.)

So, back to the reason for this thread. The EVIC is so compromised by its offbeat computational algorithm that there is no way the 29 MPG reading can be viewed as credible. That doesn't mean 29 MPG isn't possible, but it can be ascertained with reasonable certainty only by manually computing from odometer and gas pump readings.
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  #30  
Old 04-23-2012, 12:31 PM
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Re: 2012 JGC gets 29 MPG??

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Originally Posted by fourwheelin7 View Post
Have 31,000 miles on mine and just recently did a 180 mile one way trip with cruise set at 60 mph. Had to follow mother-in-law driving an RV and averaged 27.5 MPG, my usual average speed is 73 and I get 21-22 MPG. So if you can drive 60 MPH on the highway all the time I'd say it's absolutely possible.
Good point. I once drove 45mph about 60 miles on the interstate to follow a friend who was using a temporary spare. This was in a Ford Expedition and I averaged 27mpg.
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  #31  
Old 04-24-2012, 08:35 PM
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Re: 2012 JGC gets 29 MPG??

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Think we could put together a great commercial, back in the 70s Phoenix->LA was popular because it is downhill. We could go one better and make it Tucson->LA on one tank easy (even more downhill). Bet under the right conditions & 51 psi in the Forteras we could hit 30.

Picture a happy smiling family of five (and the dog) heading into Wally World with a three word caption: "30 mpg. Jeep"
Phoenix to LA is net downhill, but it's not "downhill" all the way. You climb a couple of small mountain passes in AZ, get down to near sea level when you cross the Colorado river, then climb again until Chiraco Summit east of Indio. From there it's more or less downhill. It's a nice ride in my new JGC
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  #32  
Old 04-24-2012, 08:58 PM
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Re: 2012 JGC gets 29 MPG??

Just did a cross prairie trip from Winnipeg to Edmonton, Canada...1350 km total trip. I had 4 adults, I was driving 120 km/h, and we had full cargo (suit cases, cooler, etc).

My WK2 Overland Hemi got 20.1 mpg. Not bad at all considering as you drive west you are climbing in elevation plus there are hills and so on.

Total miles on overland now is 16,000.
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  #33  
Old 04-24-2012, 09:08 PM
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Re: 2012 JGC gets 29 MPG??

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  #34  
Old 04-24-2012, 10:58 PM
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Re: 2012 JGC gets 29 MPG??

What I meant to add was that if the DTE is a blend then it should be accurate with the engine off (no instantaneous to blend).

Further the distance since fillup plus the DTE (engine off) divided by ave mpg should equal 24.6 gal (ish) - I just got 24.85 or a 1% delta.

" I can drive 150 (100% hwy) miles and hop off the freeway and step on it a couple times for 1mile and it will drop almost .5 mpg which is not possible"

Sure it is: say 150 miles at 25 mpg uses 6 gallons. 151 miles at 24.5 uses 6.16 gal so for 1 mile you averaged 6.25 mpg, not hard at all if "stepping on it a few times". I see instantaneous drop to near zero when accellerating from a stop (helps to have a digital readout taking a snapshot every second), also have seen a couple of flat miles with cruise at 60 averaging near 40 mpg.

When I was growing up, fuel economy rallys were popular monthly events & I have a collection of interesting trophys including one first place from the Federal Energy Authority. It is just a different form of competition & in some ways harder than road racing.
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