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Many of you may have experienced this,but if you haven't you will.
Preface: At 8000 miles i changed my mileage number on the computer to accurately give the correct mileage. Mine is set at .964.
I keep mileage on my f350. The other day i filled up my truck with $100 worth and reset my trip meter. My mileage for the pryor tank was 15.5 mpg.
Notice the mileage, 18.7 mpg. My truck is a 7.3 with 4.30s. I knew this was off by 2 mpg. This is the problem. The inaccurate data continues to display until the truck is turned off and sits.
This is the mileage driving the same way going home. Notice the difference. This happens every time. So for those of you looking to check mileage, the computer is off even when you reset it to account for factory calibration. This morning is right where it should be at 16.6 mpg for my commute loop.
Preface: At 8000 miles i changed my mileage number on the computer to accurately give the correct mileage. Mine is set at .964.
Sorry for a newbie question, but what does the above mean? Is this a forscan setting? how do you adjust the mileage to try and correct the built-in mpg estimation?
Sorry for a newbie question, but what does the above mean? Is this a forscan setting? how do you adjust the mileage to try and correct the built-in mpg estimation?
I don't even look at the MPG average on the dash anymore. It's absolute malarkey. On my last tank, I tried to baby the truck and see how high I could get the meter to read. 14.5MPG is what it told me. Calculated by hand at my next fill up, 12.3. I don't appreciate the truck lying to me to make itself look better.
Some folks report great results from their Lie O Meter. Some will reset the AFE and then have great results. I don’t. I hand calculate every tank of fuel I put in. I took my averages and reset my AFE and it still doesn’t work. Sometimes it’s over, sometimes it’s under and every once in a while it’ll be really close. I personally think it’s worse if you do a lot of mixed driving… city, stop and go, highway, loaded, unloaded, etc… regardless, I never trust mine and just hand calculate it so I know exactly what the number really is.
If the truck has been running, then you fill it and reset the trip meter, it always happens. The error is higher in the summer then the winter months. I think Fords computer programmer needs to go back to school.
You also have to be careful hand calculating as well. The 2022 6.2L I purchased has been the first new Ford SuperDuty ive owned that has been accurate (speedometer/odometer) from the factory. Ive purchased eleven new F250/F350 since 2005 and every one even my 2022 7.3L was off between 1%-3% on the odometer, making hand calculated miles false as well. Youll never be 100% because of tire wear and air pressure but you can get it dialed in to under 1% difference for hand calculating.
You also have to be careful hand calculating as well. The 2022 6.2L I purchased has been the first new Ford SuperDuty ive owned that has been accurate (speedometer/odometer) from the factory. Ive purchased eleven new F250/F350 since 2005 and every one even my 2022 7.3L was off between 1%-3% on the odometer, making hand calculated miles false as well. Youll never be 100% because of tire wear and air pressure but you can get it dialed in to under 1% difference for hand calculating.
Confirm by GPS. The 2012 I had was exactly like this, 55 was 53, 60 was 57. It does affect the odometer. What I did find out though, using the ODBII port and a gauge setup on the Kenwood head unit, it reported the same results the GPS did, the speedometer itself was off. Was the odometer also off, or was it accurate? Thats the part that I wasn't sure of. My 19 F-450 though is dead on, 55 is 55. 60 is 60. The cruise OTOH if set to 60 might be 58, but that is the gearing doing that, as it eventually does get to 60 depending on the road grade.
Now when I did the F-150 with 3.5EB and 10 speed, I actually went a bit pessimistic, set it just a bit under actual, so if it was 20.2 actual, it read 20.1. When I got 23.2, it read 22.3. What I found is the closer the economy is to the actual setting performed, meaning if you set it based on getting 20 MPG, when you get above or below it, the accuracy goes away. If you are within 1 MPG of the setting it stays pretty accurate, but when it goes above or below that threshold, it varies quite a bit.
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