Fuel economy computer accuracy
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Joined: Jan 2011
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From: Union City, TN
Fuel economy computer accuracy
I bought a 2013 XLT 4X4 wiht 5.0 V8 about 3 months ago. I reset the computer when I first bought it and it shows an average of 15.7 MPG. I have also kept records of all fuel purchased and my actual mileage is 15.2 MPG.
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My 11 Eco was very accurate (when I would fill up it was within 0.2 gallons of what the computer said I had used).
My 13 Eco is always 1.0 to 1.2 gallons low on the computer when filling up.
I am going to tell the dealership next time I am by there and see if there is anything they can do (new updated program or something) to fix it.
My guess is they purposely made it wrong in order to indicate a higher MPG on the dash which is what most people go by. That would keep down a lot of MPG complaints.
My 13 Eco is always 1.0 to 1.2 gallons low on the computer when filling up.
I am going to tell the dealership next time I am by there and see if there is anything they can do (new updated program or something) to fix it.
My guess is they purposely made it wrong in order to indicate a higher MPG on the dash which is what most people go by. That would keep down a lot of MPG complaints.
Posting Guru
Joined: Jul 2008
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I have a really small sample size so far, but tank one the computer said 17.1 mpg, actual mileage was 17.2. Tank two computer said 18.1, actual mileage was 17.6.
I keep track of mileage on fuelly.com so I'll try to update this later when I have a larger sample size.
I keep track of mileage on fuelly.com so I'll try to update this later when I have a larger sample size.
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My '12 F-150 Lariat EcoBoost also is slightly off with the MPG computation. If you use the remote start feature, this can throw off the MPG as the truck runs for a few minutes prior to moving it, using some fuel...............
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Joined: Apr 2006
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Car and driver had an article several months ago talking about this same issue. Some cars are reporting between 5 and 6 per-cent better mpg than actual mpg. Link to the article and a way (according to them) to get more accurate results from the on board sensor.
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Joined: Nov 2006
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From: SE Wyoming
IT is funny I have never had a LOM that read low, every one has read higher than real world results. After about a year my Mustang probably did the best job, it got to almost .5mpg. My F150 stays .8-1.5 over, it varies quite a bit for just being a commuter. The work trucks are worse but they can do a lot of idling and slow moving at times which really screws up the LOM.
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