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Old Nov 14, 2008 | 08:36 AM
  #1  
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MPG reader

hello everyone, names kris, i just recently bought a 99' f-250 PSD. Its the lariat model so it has the compass, temp, and mpg reader on the headliner and for some reason all of the options seems to be reading perfect except for my mpg, and miles till empty. Its giving me a reading but its saying im getting like 25mpg and im only getting about 12. So i was wondering if this was a common problem, or if there is a cheaper fix than taking it to the shop.

Thanks for any input!
 
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Old Nov 14, 2008 | 08:39 AM
  #2  
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Hey, Kris. You are talking about what we call the "Lie-O-Meter". Some are close and some are way off. Do the calc. by hand, then you know what you are getting.
 
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Old Nov 14, 2008 | 08:40 AM
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Originally Posted by Kris.
hello everyone, names kris, i just recently bought a 99' f-250 PSD. Its the lariat model so it has the compass, temp, and mpg reader on the headliner and for some reason all of the options seems to be reading perfect except for my mpg, and miles till empty. Its giving me a reading but its saying im getting like 25mpg and im only getting about 12. So i was wondering if this was a common problem, or if there is a cheaper fix than taking it to the shop.

Thanks for any input!
Do you have any modifications to your truck like a chip or tuner? If so, then that's the problem, and there is no fix. A chip or tuner causes the overhead display to show higher mileage than what you are actually getting.
 
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Old Nov 14, 2008 | 04:54 PM
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Hey, wecome to fte. Nice name.
 
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Old Nov 14, 2008 | 05:33 PM
  #5  
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when I got mine working after I bought it, it started off reading around 12.5 mpg, and over the past 2 years it has made it to around 14.7 mpg. Doing hand calculation of mpg, I usually am around 16-17 depending on how much town driving I do. I dont even use it for the mpg I only use it for the outside temp, now and then I use the miles till empty to get an idea as that is iffy too, I can start the truck and it will show 190 miles till empty and drive 30 miles and it will show 60 miles till empty and this is while taking it easy on the highway.

but right now im getting 0 miles to 0 gallons as its parked with a bad tranny till my winter break next month when I make a trip down to BTS for one that can handle the power.
 
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Old Nov 14, 2008 | 06:53 PM
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Originally Posted by strokin_it7.3
Hey, wecome to fte. Nice name.
This might make more sense to the new folks if you put your name back in your sig.

Tire sizes will also change this reading if you're running something other than the stock size.

Welcome to FTE.
 
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Old Nov 14, 2008 | 07:24 PM
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Did the 99's come with temp gauges on it? Mine doesn't, and I'd like to have it. Mine read MPG, direction, and miles til empty, and then a blank reading. If that's the way it comes, can I install a sensor to make it read the OAT?
 
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Old Nov 14, 2008 | 07:32 PM
  #8  
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Originally Posted by mongo75
Did the 99's come with temp gauges on it? Mine doesn't, and I'd like to have it. Mine read MPG, direction, and miles til empty, and then a blank reading. If that's the way it comes, can I install a sensor to make it read the OAT?
Do you have one of these?


That's the sensor, and it mounts just under where the zoodad goes. I've got no idea where the wires go, but could do some digging to see if I can find out if you don't have the sensor on your truck.
 
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Old Nov 14, 2008 | 07:44 PM
  #9  
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I just took a look, and I don't have a sensor.
 
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Old Nov 14, 2008 | 07:59 PM
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Originally Posted by mongo75
I just took a look, and I don't have a sensor.
Supposed to be cold and windy tomorrow (high of 60) and not get back up to the 70's till Sunday. Since it looks like I have some time on my hands avoiding the cold, I'll do some digging and see if I'm smart enough to figure anything out for you.
 
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Old Nov 14, 2008 | 08:23 PM
  #11  
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ok this is all making sense i think. my suspension and tires are stock i believe. But the owner before me did have a chip in the truck. so im guessing thats what is cuasing my problem. oh well i guess ill just have to put a chip back in and get my mpg the old fashioned way! thanks for all the help and input guys, i really appreciate it!
 
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Old Nov 14, 2008 | 08:56 PM
  #12  
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With my DP tuner my lie-o-meter reads about 23 MPG in a dually LMFAO!!!!
 
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Old Nov 14, 2008 | 09:00 PM
  #13  
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My SC really screwed mine up, said I was in the mid 20's also. Since the DP I am within a 1/2 per gallon of being right.
 
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Old Nov 14, 2008 | 11:11 PM
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How old are you kris?
 
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