Fuel mileage and gallons used highly inaccurate
#1
Fuel mileage and gallons used highly inaccurate
Wondering if others are seeing this problem on their 2015s. I have a Lariat 5.0 with 36 gallon fuel tank. The gallons used is typically running 10%+ UNDER what it really has used when I fill up, and the average MPG is anywhere from 2 to 2.5MPG higher than what it really gets hand calculated after a fill up. The only fuel measure that seems somewhat close to accurate is the miles to empty.
Today when I filled it up it held 34 gallons, in spite of the gallons used being only at 30.1.
I like all the information it provides, I just wish it were a bit closer to reality.
Today when I filled it up it held 34 gallons, in spite of the gallons used being only at 30.1.
I like all the information it provides, I just wish it were a bit closer to reality.
#4
Mine is just the opposite. A 2014 SCrew. The computer mileage shows about 2+ mpg short of figuring it by hand. Typical Ford truck gauge, the top half is much larger than the bottom half. Right now I have the gauge showing half a tank with a little over 300 miles on the tank. I have the standard tank. I never let my tank get below 1/4.
#5
The algorithms and sensing capability in these trucks is somewhat limited, I think. My 2014 seems to be understating the fuel used by about 0.3-0.4 gals in 18-20 gals used and, the displayed mileage is correspondingly higher than what my "hand" calculations show at each fillup. Still, it's more accurate than the lie-o-meter that was in my 2005 truck.
- Jack
- Jack
#6
If our trucks are using the bobbers I've seen in countless track cars, they'll suffer from the same estimation/guessing problems that fuel gauges have had for years. It's getting easier to detect the inconsistencies because of the digital readouts. Much harder to see the variance on an analog needle.
Don't forget the impact on liquid volume/density ambient temperature and altitude can have as well. 4 gallons different? Maybe not, but you'll need a larger data set to compare.
What I find interesting is that my MPG estimation is going up by .1 every few days I drive it (less than 2k miles on it so far). Even by hand I can't make it do that unless the numerator is actually improving .
Don't forget the impact on liquid volume/density ambient temperature and altitude can have as well. 4 gallons different? Maybe not, but you'll need a larger data set to compare.
What I find interesting is that my MPG estimation is going up by .1 every few days I drive it (less than 2k miles on it so far). Even by hand I can't make it do that unless the numerator is actually improving .
#7
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#11
Filled mine this AM. Took 14.7 gallons with gauge reading half a tank. I have the standard 26 gallon tank. Dash said the fuel mileage was 16.7. Total miles driven was 312. My calculator says that's 21.3 mpgs, not 16. The truck normally falls in the 20+ mpg range as I drive hiway mostly but so far it's been mixed with some town driving.One thing I did notice. Sitting at a light really hammers the dash mpgs. It can fall an easy .5-.7 mpgs at just one normal traffic light. Seems like a lot even at the end of the tank. I can see it fall at the very beginning but not at the end.
#12
#13
What a lot of people fail to realize is that sitting still with the engine running is the worst MPG possible. You are going 0 miles but still using gallons. If you were to put your foot to the floor once the light turned green your mileage would actually go up. Since you would now be getting 2-3 MPG instead of 0.
#15