Does a tune mess with accuaracy of the overhead mpg meter? - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 03-17-2011, 05:56 PM Thread Starter
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Does a tune mess with accuaracy of the overhead mpg meter?

Thinking about getting a tune for my 03 6.0 and remember way back when the 99's first came out the tunes were really messing withthe accuracy of the overheads. I was curious if this was still the case with the 03's and 6.0's Thanks
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post #2 of 9 Old 03-17-2011, 08:59 PM
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I use the Scangauge to monitor fuel flow and when programing my truck with Max Energy by Hypertech the calibrations are off by as much as 43%. The MPG would indicate 143% of of the real value. I am able to recalibrate it at fuel fill up and after a few tank fillup the calibration is within 1%.

So If a programer is used I think you need a calibratable Lie O'meter.

2005, 6.0L, 6 Spd Std, 3.73 Rear End, F250SD, Extended Cab, 4 x 4 Long Bed. 2008 extension mirrors. GPS/TV/DVD/CD/Rear Cam/Radio installed, Max Energy programer by Hypertech, and Fuel Pressure Gauge. ScanGaugeII for 60 plus XGauges, and MPG. ELC Cat EC-1 Coolant, Pull a 39ft 15500Lbs 5th Wheel Camper Trailer. Mileage Avg is 20MPG, and pulling 12.6MPG.
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post #3 of 9 Old 03-17-2011, 09:11 PM
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Quote:
Originally Posted by DENALI View Post
Thinking about getting a tune for my 03 6.0 and remember way back when the 99's first came out the tunes were really messing withthe accuracy of the overheads. I was curious if this was still the case with the 03's and 6.0's Thanks
It's off to begin with...so whats the difference?

You should always hand-calculate it, otherwise.... it's wrong... end of story.

I have a handy little app on my phone I use to track all my fill up info, It takes the price of diesel, how many gallons, and odometer reading, then calculates MPG, average daily cost, average fuel economy, (overall) average cost per mile, per day, etc. Love it!
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post #4 of 9 Old 03-17-2011, 09:11 PM
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My factory MPG calculator (lie-O-meter) is ALWAYS within 0.2 MPG of my hand calculated figures.


Running an SCT w/ custom tunes, on an 07'

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2007 - F-250 Lariat OUTLAW
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post #5 of 9 Old 03-18-2011, 05:48 AM
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Quote:
Originally Posted by ToMang07 View Post
It's off to begin with...so whats the difference?

You should always hand-calculate it, otherwise.... it's wrong... end of story.

I have a handy little app on my phone I use to track all my fill up info, It takes the price of diesel, how many gallons, and odometer reading, then calculates MPG, average daily cost, average fuel economy, (overall) average cost per mile, per day, etc. Love it!
whats the app??!?!?
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post #6 of 9 Old 03-18-2011, 05:13 PM
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yeah whats the app?

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post #7 of 9 Old 03-18-2011, 05:20 PM
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Quote:
Originally Posted by 07OUTLAW View Post
My factory MPG calculator (lie-O-meter) is ALWAYS within 0.2 MPG of my hand calculated figures.


Running an SCT w/ custom tunes, on an 07'
Same here

Email: Dave@powerstroke.org
2011 F150 Ecoboost Crew cab lariat. Custom tunes from KEM and 5Star, and Unleashed
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post #8 of 9 Old 03-18-2011, 07:08 PM
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It was "Gas Book Free" The station search doesnt work so great, but as far as record keeping, its awesome!
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post #9 of 9 Old 03-19-2011, 07:54 AM
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My Lie o Meter is with in .5mpg running SRL++ and it's 1.5-2mpg low when I run SRL+, but it's dead on when it was stock.

2007 F250 CC Lariat
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