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Thank you for your replies.
Fuel consumed during idling will make a slight difference, which I had not considered--good point--although I suspect it is not 10% of total consumption. Tire sizes affect the speedo reading, and it is common for speedometers and odometers to overread, even with stock standard wheels and tires. GPS speed is very accurate, however, typically within a fraction of a kilometre (or mile) per hour. Doppler shift is used to correct for the unit approaching or driving away from each satellite in use at the time. Speed is calculated several times per second, although some devices may only display an average of the last three or four seconds. Unless one constantly drives only uphill, or only downhill (which we cannot do for long) the minute differences which might result from climbing or descending a hilly road are almost unmeasurable, and uphills and downhills should cancel out. The GPS satellites are orbiting about 12,000 miles, or about 63.3 million feet, above the earth, so even the instant speed difference due to vertical road changes is infinitesimal.
Have you used Fuelly, or a notebook, or some other method to compare actual consumption to the displayed averages? I'm still left with a rather large and one-sided difference between real and displayed mileage.
 

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I'm a big advocate of using Fuelly to track your fuel economy, as tracking the data could give you some indication of slowly induced mechanical problems
This is mine right here

1) I agree that the hand calculated consumption will always be more than the instrument panel. There are many factors to this including idling time etc.
2) GPS speed cannot be taken as gospel. GPS relies on satellite triangulation, not necessarily taking into account changes in elevation. What I mean is even though you may be driving on one stretch of what looks like flat road, the position of the satellites could be doing a calculation of you travelling upwards towards one or two of the satellites.
3) While you are moving, so are the GPS satellites. I don't believe current technologies are perfect to account for this.
4) GPS speeds will always be lagging due to signal travel times.
5) I have noticed the speed on my HUD (I have an ultimate) also has a few percentage discrepancy with the speedo gauge.
6) Speedo differential could also be due to changes in tire size / manufacturer calibration.
I have just over 331 miles...yes it is brand new...and I'm averaging 29.3 mpg. Most of my driving is on city streets so I am pleased with this as it is a gas sipper compared to our two other SUVs.
 

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My fuel economy is nowhere near high as the rest of you guys and now worried its a problem. After 245.5 miles my mpg is 18.5 on a brand new 2020 Kona SE FWD. This is all city. Is this normal or should I bring this up to the dealer?

Little background... I drive most of my miles between 25-50mph. On normal (not sport). I drive it delicately and dont gas the pedal or anything. I do spend 10-15min idle in the car after a workout (7 days/wk) but this doesnt seem to change the mpg info (only changes when I actually drive and not parked).

What's going on here?
 

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Many variables are in play from quality of fuel to ambient temperature to driving habits. 245 miles is too small a sample size. Most new engines won't see peak efficiency until several thousand miles and after ECU has "learned" your driving habits.
 

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2020 Hyundai Kona SEL
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I just wish the fuel economy readout on the dash were a little more accurate. To me, it's about 2 mpg too optimistic. For what it's worth, when I do the math at fill-ups, I'm currently averaging 27-28 mpg. I do live in an urban area, so I can't wait to get an opportunity to drive it out of town on the interstate. Maybe I'll make a day trip to a casino in a couple of weeks, lol.
 

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i have a 2019 SE 2.0 that i got in July. certified pre owned with 10,000 miles on it. my driving is 100% city driving and it seems my mileage is not so good,. i`m not heavy on the gas pedal and not using sport mode and the car computer is reading 18 mpg. in reality it`s around 16 mpg figuring in the 2 mpg computer over read that most people see.
 

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2018 Kona SEL, AWD, Tech Package in Chalk White
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32-33mpg on interstate/highway trips (keep under 80 for better mileage), 28-30mpg on city streets/work commute. (2018 SEL AWD, 30K miles)
 
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