MPG has dropped over the summer - Kia Niro Forum
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post #1 of 30 (permalink) Old 08-08-2019, 08:57 PM Thread Starter
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MPG has dropped over the summer

2018 HEV here. I kept reading how everyone was saying that their MPG got better in warmer weather compared to winter time. Well, the opposite has happened with my Niro.

In the winter and early spring my Niro was averaging 52-58 mpg around town and 42-46 mpg on the highway.

Now that summer is really here now, city mpg has dropped considerably but highway mpg has stayed the same. City mpg has dropped from 52-58 to 42-46 mpg!!

My tire pressure is good at 37-38 psi. Got an oil change done last month and it did not change the mpg. It now has approximately 17,500 miles on it now after 7 months of ownership.

Now, I do always have the A/C maxed out at all times due to living in Texas with 100+ degree days, 70+ degree dew points, and my Niro is black as well.


So am I the only one who’s mileage has dropped during summer?
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post #2 of 30 (permalink) Old 08-08-2019, 10:45 PM
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Make sure your air filter is clean also.

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post #3 of 30 (permalink) Old 08-08-2019, 10:47 PM
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Not so surprising if you went from temperate winter weather to scorching hot and maxing out your AC.

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post #4 of 30 (permalink) Old 08-09-2019, 08:38 AM
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Originally Posted by 91cavgt View Post
2018 HEV here. I kept reading how everyone was saying that their MPG got better in warmer weather compared to winter time. Well, the opposite has happened with my Niro.

In the winter and early spring my Niro was averaging 52-58 mpg around town and 42-46 mpg on the highway.

Now that summer is really here now, city mpg has dropped considerably but highway mpg has stayed the same. City mpg has dropped from 52-58 to 42-46 mpg!!

My tire pressure is good at 37-38 psi. Got an oil change done last month and it did not change the mpg. It now has approximately 17,500 miles on it now after 7 months of ownership.

Now, I do always have the A/C maxed out at all times due to living in Texas with 100+ degree days, 70+ degree dew points, and my Niro is black as well.


So am I the only one who’s mileage has dropped during summer?
FWIW

max ac consumes ~ 1500 watts

30mph driving consumes ~5000 watts, 70mph ~15000 watts

Max ac is ~ 30% hit on 30mph driving and ~10% hit on 70mph driving.

2018 Niro PHEV LX Silver/charcoal

Last edited by charlesH; 08-09-2019 at 08:41 AM.
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post #5 of 30 (permalink) Old 08-09-2019, 09:18 AM
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91CAVGT- when you are using A/C, do you put it on driver only if just you driving; and do you have the fan on max or near max speed? I have found that makes a difference in MPG over that used running on just driver at ~3 fan speed. When running like this, the MPG cost is not much, certainly less than the old belt driven A/C's. Maybe even less than running with windows open. I run mine nearly all the time in summer also, temps currently in upper 80's-low 90's.


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Last edited by realto; 08-09-2019 at 09:21 AM. Reason: add sentence
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post #6 of 30 (permalink) Old 08-09-2019, 12:07 PM
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91CAVGT- when you are using A/C, do you put it on driver only if just you driving; and do you have the fan on max or near max speed? I have found that makes a difference in MPG over that used running on just driver at ~3 fan speed. When running like this, the MPG cost is not much, certainly less than the old belt driven A/C's. Maybe even less than running with windows open. I run mine nearly all the time in summer also, temps currently in upper 80's-low 90's.
yes, driver only ac and 3 fan speed is 500w vs 1500w for max ac

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post #7 of 30 (permalink) Old 08-09-2019, 02:14 PM
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Recirculate setting will reduce energy use.
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post #8 of 30 (permalink) Old 08-11-2019, 07:36 AM
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Recirculate setting will reduce energy use.
I guess that's true in that it will make the air cooler so you can turn the fan lower, otherwise I don't know why it would reduce energy. The A/C comp pump is running at a set speed, if you have it running all the time it doesn't know if you have it on recirc or not. Except the fan works a little better when it's not pushing through a filter.


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post #9 of 30 (permalink) Old 08-11-2019, 09:05 AM
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AC should not be running after you reach set temperature - electrically driven by the way, it has its own motor - no belt. Recirculate means it will be off more. Or run at a slower speed if motor speed is adjustable.
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post #10 of 30 (permalink) Old 08-11-2019, 06:07 PM
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Any difference with the amplifier on or off? Just wondering because I have one. But I wouldn't trade it for mpg.
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