Need help from other 2015-16 F-150 5.0 Owners
02-15-2018, 08:34 AM
#21
Justor, I have a 2017 Screw with the 5.0 and mine consistantly shows1-2 mpg more than I actually get manually calculating. I checked my wife's 2017 Edge and her computer lies constantly too and is off by atleast 1 mpg. Frankly it's unexceptable to me and I think Ford is inflating the MPG in many peoples minds by forcasting wrong information. I have spoken to many owners of the F-150 who love their trucks like I do but hate the fact that the fuel computer is consistantly off by a large margin. By the way I'm averaging around 18.5 MPG. If you care to look at my MPG figures and how far off my computer is, look for me on Fuelly.com and you can see my notes on every fuel up since new. I'm now around 8800 miles .
Last edited by HarleyTwitch; 02-15-2018 at 08:45 AM. Reason: Add information
02-15-2018, 09:51 AM
#22
Senior Member
Justor, I have a 2017 Screw with the 5.0 and mine consistantly shows1-2 mpg more than I actually get manually calculating. I checked my wife's 2017 Edge and her computer lies constantly too and is off by atleast 1 mpg. Frankly it's unexceptable to me and I think Ford is inflating the MPG in many peoples minds by forcasting wrong information. I have spoken to many owners of the F-150 who love their trucks like I do but hate the fact that the fuel computer is consistantly off by a large margin. By the way I'm averaging around 18.5 MPG. If you care to look at my MPG figures and how far off my computer is, look for me on Fuelly.com and you can see my notes on every fuel up since new. I'm now around 8800 miles .
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02-15-2018, 12:04 PM
#24
Hi everyone,
I need help from other 2015-16 F-150 5.0 Owners to see if this is normal behavior or did I get lemon. I am a Network Engineer by trade and know from experience computers are not infallible and need to be checked once in a while to make sure they are correct.
I have a 2013 Mustang 302 Boss, when I check the gas mileage it is dead on with the display with the max of .2 tenth of a gallon off. Last fill up it said I used 9.2 and in reality it used 9.4 totally acceptable margin
With my 2016 F-150 5.0 I am getting 2 to 2.5 Gallons off.. which to me is a huge red flag that something is wrong if the Computer say it you should have gotten 17.1 Mpg and it is only getting 14.5, I took it back to the 5 Star Ford dealership which was a huge waist of time. They plugged a computer in to the computer and it said that it is fine... really? I asked did you ever top off the tank and do the manual math...? No we didn't that is not the industry standard test for mpg. What the hell that is the standard for the last 100 years since cars were invented.
If other 5.0 Truck owners can test their trucks to compare what it reports verse reality and let me know if theirs are close to what is reporting or wildly off like mine it would be a big help. I have a feeling I got a lemon and will need to get rid of it.
Thanks
I need help from other 2015-16 F-150 5.0 Owners to see if this is normal behavior or did I get lemon. I am a Network Engineer by trade and know from experience computers are not infallible and need to be checked once in a while to make sure they are correct.
I have a 2013 Mustang 302 Boss, when I check the gas mileage it is dead on with the display with the max of .2 tenth of a gallon off. Last fill up it said I used 9.2 and in reality it used 9.4 totally acceptable margin
With my 2016 F-150 5.0 I am getting 2 to 2.5 Gallons off.. which to me is a huge red flag that something is wrong if the Computer say it you should have gotten 17.1 Mpg and it is only getting 14.5, I took it back to the 5 Star Ford dealership which was a huge waist of time. They plugged a computer in to the computer and it said that it is fine... really? I asked did you ever top off the tank and do the manual math...? No we didn't that is not the industry standard test for mpg. What the hell that is the standard for the last 100 years since cars were invented.
If other 5.0 Truck owners can test their trucks to compare what it reports verse reality and let me know if theirs are close to what is reporting or wildly off like mine it would be a big help. I have a feeling I got a lemon and will need to get rid of it.
Thanks
02-15-2018, 05:23 PM
#25
Senior Member
As said above, this inaccurate calculation has been over-discussed on this forum. My 2005 Lexus LS430 was always within .1 MPG in its calculation and that's exactly what I would expect from a computer controlled vehicle. The vehicle computer knows exactly how much fuel is being consumed by the engine at all times, the computer should be able to tally that up and make the simple calculation. After all, fuel consumption has a direct effect on exhaust emission which is tightly controlled. My V8 2017 has always been about 1 mpg below what the trip computer says. I believe Ford and most manufacturers do this so owners can report to their friends how good their mileage is. They inflate the numbers by an amount they think the market will put up with because only a very small percentage of owners actually care to check. Fuelly.com is a good place to track if you care.
Now as far as tire size affecting the calculation, that's just flat out wrong, unless you are comparing actual miles travelled over the earth vs miles the vehicle thinks it travelled based on wrong tire circumference. For vehicles with GPS this correction could be made but no one is asking for that level of accuracy. When tire size changes, mph changes and there will be a corresponding change is actual miles travelled over the earth vs odometer reported miles. The next time you are on a highway with mile markers just note your odometer including the decimal place when passing a certain mile marker and do that again a hundred and again two hundred miles down the road. If you can't go that far do what you can. See how far off you are. I owned a 2000 Honda mini van that reported too many miles based on actual miles travelled by 4%. So the problem was that with a 100,000 mile warranty my van had not travelled 100,000 miles but actually less than 97,000. So when a major part malfunctioned and the odometer reported 101,000 miles, I had only gone 98,000 miles over the earth and should have been "covered under warranty" but my claim was denied since the odometer reading was 101,000. This to me is a bigger problem than wrong mph or the computer reporting wrong mpg.
Now as far as tire size affecting the calculation, that's just flat out wrong, unless you are comparing actual miles travelled over the earth vs miles the vehicle thinks it travelled based on wrong tire circumference. For vehicles with GPS this correction could be made but no one is asking for that level of accuracy. When tire size changes, mph changes and there will be a corresponding change is actual miles travelled over the earth vs odometer reported miles. The next time you are on a highway with mile markers just note your odometer including the decimal place when passing a certain mile marker and do that again a hundred and again two hundred miles down the road. If you can't go that far do what you can. See how far off you are. I owned a 2000 Honda mini van that reported too many miles based on actual miles travelled by 4%. So the problem was that with a 100,000 mile warranty my van had not travelled 100,000 miles but actually less than 97,000. So when a major part malfunctioned and the odometer reported 101,000 miles, I had only gone 98,000 miles over the earth and should have been "covered under warranty" but my claim was denied since the odometer reading was 101,000. This to me is a bigger problem than wrong mph or the computer reporting wrong mpg.