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-   -   Distance To Empty Display (http://www.jeepgarage.org/f73/distance-to-empty-display-19904.html)

plynn7 03-07-2011 07:15 PM

Distance To Empty Display
 
Question about the DTE read out on the EVIC, I have noticed the DTE drops more the the miles that I am driving. For example, the average mpg will be steady, say at 16 mpg and the DTE will show 200 miles, I will drive 2 miles, but the DTE will drop like 7miles down to 193 and I only drove 2 miles, another example is, today I park and the DTE says 190 miles and the average mpg shows 16.1 mpg. I get back in, start it up and now the DTE shows 187 miles and the average mpg still shows 16.1.I drove 6 miles and at the end of my trip the DTE dropped to 176 miles an the mpg stayed at 16.1. Anyone know how this works?

SixZeroFour 03-07-2011 07:55 PM

Re: Distance To Empty Display
 
The DTE seems to have a much slower calculation interval than the average mpg - probably so you get a more consistant number rather than have it jumping all over the place and essentially making itself useless. Is your reading of 16.1 just a sample from that particular trip or had it been calculating that number for quite some time?

I first noticed the slow reaction after a fill up when the DTE did go up substantially but not as high as it should have. After leaving the gas station it slowly increased for quite some time even though I was putting additional miles on it at the same time.

SvenskaJeepGuy 03-07-2011 08:01 PM

Re: Distance To Empty Display
 
its not an exact science, just an estimate

Rosewood 03-07-2011 11:23 PM

Re: Distance To Empty Display
 
i am going to get killed over this one

my thinking is that the mpg is tied to the reading of the mph, since the mph reads a few miles faster it appears the mpg is higher.

i think the DTE is linked to the weight of the remaining fuel in the tank

let the flame begin

scittb 03-07-2011 11:37 PM

Re: Distance To Empty Display
 
dont know if its a factor or not, but when you fill up your filling above the full tank most likely and into the filler neck. Dont forget the pump shuts of when it senses the pressure. So you will be driving for a bit and the sender or float wont move for a bit till the tank itself starts to drain. Im sure this fudges the calculations until the float starts lowering......maybe? So question would be when do the irregularities start mid tank, full tank etc..?

plynn7 03-07-2011 11:46 PM

Re: Distance To Empty Display
 
Quote:

Originally Posted by scittb (Post 371268)
dont know if its a factor or not, but when you fill up your filling above the full tank most likely and into the filler neck. Dont forget the pump shuts of when it senses the pressure. So you will be driving for a bit and the sender or float wont move for a bit till the tank itself starts to drain. Im sure this fudges the calculations until the float starts lowering......maybe? So question would be when do the irregularities start mid tank, full tank etc..?

Dosen't seem to matter how much fuel is in the tank, just seems that when I drive a specific distance the DTE is always dropping more then then the distance driven.

BHHJEEP 03-07-2011 11:56 PM

Re: Distance To Empty Display
 
Quote:

Originally Posted by plynn7 (Post 371270)
Dosen't seem to matter how much fuel is in the tank, just seems that when I drive a specific distance the DTE is always dropping more then then the distance driven.

Are you driving on a o° incline with no speed variation? If there is hills and varying acceleration than of course the DTE will change.

I have had mine go up several miles when I was on heavy downhill routes.

pwguy 03-08-2011 08:22 AM

Re: Distance To Empty Display
 
I find the DTE display to be very useful. It works the only way that seems logical to me.

From the Owners Manual:

"Distance To Empty (DTE)
Shows the estimated distance that can be traveled with the fuel remaining in the tank. This estimated distance is determined by a weighted average of the instantaneous and average fuel economy, according to the current fuel tank level. DTE cannot be reset through the SELECT button.
NOTE: Significant changes in driving style or vehicle loading will greatly affect the actual drivable distance of the vehicle, regardless of the DTE displayed value.
When the DTE value is less than 30 miles (48 km) estimated driving distance, the DTE display will change to a “LOW FUEL” message. This display will continue until the vehicle runs out of fuel. Adding a significant amount of fuel to the vehicle will turn off the “LOW FUEL” message and a new DTE value will display."

Cperez 03-08-2011 09:03 AM

Re: Distance To Empty Display
 
That feature should be called EDTE (Estimated DTE). But I'm with you, pwguy; it's got its use as long as users realize that the fluctuations are normal. Those expecting a high degree of accuracy will soon find themselves on the side of the road with emergency flashers turned on.

plynn7 03-08-2011 09:11 AM

Re: Distance To Empty Display
 
Quote:

Originally Posted by Cperez (Post 371380)
That feature should be called EDTE (Estimated DTE). But I'm with you, pwguy; it's got its use as long as users realize that the fluctuations are normal. Those expecting a high degree of accuracy will soon find themselves on the side of the road with emergency flashers turned on.

I agree with you that this is just a useful tool to judge and should not be used as real world gauge. I never let my tank go below a 1/4, just to be safe. I was curious on how this thing gets it's data.

Cperez 03-08-2011 09:42 AM

Re: Distance To Empty Display
 
I gotta come clean on this-- I ran outta gas once while driving my wife's then-Volvo XC90 through West Virginia. I was flipping through radio stations when Charlie Daniels' "Uneasy Rider" came on...I turned it up to 11 and was regaling the family with my fractured version of the lyrics. Lots of hootin' and hollerin' "shut up DAD!" "TURN IT DOWN" "Please STOP" but I just kept lettin' it rip.

Near the end of the song I remember I was at the top of a long hill. I had the radio turned up so loud that I couldn't hear any engine noise but when I pressed the gas it was not very responsive. I thought I had accidentally tapped the Snow mode button, then looked at the tach and brightly glowing amber low fuel lamp. Oopsie, I had no choice but to start laughing. Still haven't lived that one down...any time we're road tripping and gas gets low OR when that song comes on, everyone fights to be the first to re-tell the tale. Aaah, family life...

"He's a snake in the grass, I'll tell ya guys,
He may look dumb but that's just a disguise..." :D


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