Accuracey of mpg moniter in the overhead console

pismo61 · **Posted:** Tue Feb 17, 2009 3:26 pm

Is the mpg monitor accurate for you guys?Mine said I got 30.1 mpg on a fillup.I calulated it and it was only 24 mpg.It does not seem to accurate.Im running stock tires no lift.Can this be adjusted?

BlackLibertyCRD · **Posted:** Tue Feb 17, 2009 3:31 pm

Just wishful thinking!

007husky · **Posted:** Tue Feb 17, 2009 4:06 pm

pismo61 wrote:

Is the mpg monitor accurate for you guys?Mine said I got 30.1 mpg on a fillup.I calulated it and it was only 24 mpg.It does not seem to accurate.Im running stock tires no lift.Can this be adjusted?

If you are runing ORM is even LESS accurate

liberty2.8 · **Posted:** Tue Feb 17, 2009 4:22 pm

Quote:

If you are runing ORM is even LESS accurate

How does the ORM affect the EVIC? Don't see the relationship. BTW, how do you like the straightpipe, 007husky? I am days away from doing mine and would appreciate any feedback, positive or negative, on noise level and performance. Sorry for the semihijack, Pismo61

007husky · **Posted:** Tue Feb 17, 2009 5:05 pm

liberty2.8 wrote:

Quote:

If you are runing ORM is even LESS accurate

How does the ORM affect the EVIC? Don't see the relationship. BTW, how do you like the straightpipe, 007husky? I am days away from doing mine and would appreciate any feedback, positive or negative, on noise level and performance. Sorry for the semihijack, Pismo61

Something must change in the computer.

For the past few months, i ve been testing mpg with n without the orm and looking at the evic and real mpg difference.

as soon as i started using the ORM, the evic went for 2 mpg difference with real world to 4 or 5 mpg difference.
The good news, I did got a 3 mpg increase in RL mpg with the orm...

RL mpg = miles/galons on the pump.

I like the straight pipe. is not THAT loud, doesn`t bother me at all. And there is nothing in there to stop the flow.

Welded the pipe myself (im a newb with the welder).

Cowcatcher · **Posted:** Tue Feb 17, 2009 7:47 pm

Of course since the odometer and speedometer are not accurate how could the console possible be correct. And if you are using the odometer reading and hand calculating you won't be accurate that way either. :roll:

pismo61 · **Posted:** Tue Feb 17, 2009 9:39 pm

The odometer and speedo are correct.Please only intelligent responces only.

Goglio704 · **Posted:** Tue Feb 17, 2009 9:45 pm

pismo61 wrote:

The odometer and speedo are correct.Please only intelligent responces only.

Learn to spell and compose a sentence before you question the intelligence of others. :roll:

Many here have found their odometer or speedometer to be inaccurate.

pismo61 · **Posted:** Tue Feb 17, 2009 10:01 pm

Hey ,Im asking a simple ? All I want are good answers.Is That to much to ask?I guess we are now in a bitching mode because I cant spell.I may be a newbe to this forum but Ive owned a TJ for maney years so I might just know a little something about Jeeps in general.Ive also belonged other jeep forums under the same name with hundreds of posts and replies.So your dumb stupid remarks are what the forums dont need.

Goglio704 · **Posted:** Tue Feb 17, 2009 10:04 pm

8 posts here and you pop off with a remark about intelligent responses only? Don't let the door hit you on the way out...

pismo61 · **Posted:** Tue Feb 17, 2009 10:17 pm

See there we go 8 posts he knows nothing and cant talk back.Anyway done ranting,back to reading.

Goglio704 · **Posted:** Tue Feb 17, 2009 10:23 pm

To answer your question, many have reported that their EVIC (overhead display) is inaccurate in its reporting of MPG. I don't remember anyone ever posting a fix for it. Try searching for the term EVIC, you might get lucky.

CATCRD · **Posted:** Tue Feb 17, 2009 11:44 pm

pismo61 wrote:

See there we go 8 posts he knows nothing and cant talk back.Anyway done ranting,back to reading.

#1 Many people have found the odometer and speedometer to be a few % inaccurate by comparing them to a GPS or mileposts. HAVE YOU? Until you have, don't dismiss someone who suggests they are inaccurate.

#2 The EVIC doesn't keep a running mpg since the last time you reset it up to an infinite number of miles. It only has a limited amount of memory in the device. I estimate it only averages the last 75-100 miles of driving. If your driving conditions vary, your hand calculated average for a 400 mile tank will of course be diffferent from the EVIC.

pismo61 · **Posted:** Wed Feb 18, 2009 12:03 am

Yes I have a trail guide in my TJ and used in the liberty everything is spot on.Thanx again for the info.Again this is 24 mpg verses 30.1 or so.

riggler · **Posted:** Wed Feb 18, 2009 12:41 am

well sorry in advance for my poor spelling or grammar, but.... the overhead display on my 05 has so far, been pretty accurate. It is bone stock and i have only put about 6k on it , but when checking rl against the overhead there hasn't been more then a 2 mpg discrepancy (sometimes a little high, sometimes a little low). When just doing highway miles, it is almost spot on. Go figure....

Cowcatcher · **Posted:** Wed Feb 18, 2009 6:19 pm

Pismo,

I wasn't kidding. Most here have found that the speedometer reads about 5% fast the odometer reads around 8%-10% slow with stock tires. If yours are both spot on you have the anomally not the norm, however if it is off and you hand calculate you will be dividing a lower mileage than you actually drove resulting in a hand calculation that could show your mileage as much as 10% lower than actual.

My odometer was about 9.2% slow calculating by interstate mileposts and later by GPS. My speedometer is almost exactly 5% off calculated by GPS and radar.

longview · **Joined:** Tue Sep 25, 2007 3:28 pm **Posts:** 88

I am with Cowcatcher. My odometer is off 8%.
If you are "hand calculating" your mileage based off the odometer, chances are you are getting mileage that is lower that it is in reality.
If I hand calculate using a GPS for mileage, my overhead is actually pretty close (off by 1-2 mpg).

BCool · **Posted:** Wed Feb 18, 2009 7:19 pm

My odometer is off by 10% and I have larger tires. I'm guessing the spedometer is about 10% off too.

warp2diesel · **Posted:** Wed Feb 18, 2009 9:11 pm

My speedometer reads 5% fast and my odometer reads 10% low. I have checked, double checked, and verified by, GPS, Maps, and driving a known distance checked previously with a certified odometer.

pismo61 · **Posted:** Wed Feb 18, 2009 9:52 pm

Thanx for the replies.I assumed if the speedo was correct the odometer was correct also.Thanx again I check it out.I was mainly looking at my speed on my GPS.

Accuracey of mpg moniter in the overhead console

Who is online