MPG has dropped over the summer - Page 3 - Kia Niro Forum
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post #21 of 32 (permalink) Old 08-15-2019, 08:08 PM
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I run the A/C all the time, at 74F, on auto setting. Mpg is definitely better during the summer (~50 mpg in winter and ~60 in summer), that's with NE weather.

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post #22 of 32 (permalink) Old 08-15-2019, 08:23 PM
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Originally Posted by 91cavgt View Post
In my opinion, with where I live, it seems like the A/C is sized a bit too small. But, during the summer it is normal to have temps into the low 100ís with dew points in the low 70ís. Not only that, but my car is black which makes a big difference.

The AC on our Prius AC was different and got cool air MUCH quicker than the Kia. Once we get going it seems to manage OK at laest for the front seats (we are only two people). I also live in Texas and this year is hotter than I remember previous years being, 100 or over day after day after... For parking during the day outside, I've also dug out the windshield reflectors and when I park put them on and set the sunroof to tilt with the cover cracked and crack both front windows a little. The car interior is now more like outside rather than EKKK! I need oven gloves to drive this thing!

The worst AC unit was a small Honda we had. Not hybrid. Just a car with way too small an AC for Texas!
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post #23 of 32 (permalink) Old 08-15-2019, 10:59 PM
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I got a 2017 Niro in May 2017. I live in NE. There are times in nice weather, w/o running AC or heat, I average as low at 28 mph, especially on longer drives. My first couple months I was getting 46-50 mpg. Then it changed in Sept. I started complaining 3 months after I bought it. They came up w/every excuse under the book: cheap gas, wind, hills, my driving, using cruise, not using cruise, driving over 55 mph. You name it, I heard it. I kept complaining with each oil change. “I’m reading Niro drivers in Wisconsin in winter with hills driving 75+ getting over 50. You promised me 49/51.” They asked me to keep track of my mileage and gas. So I did. They asked me to buy premium, so I did. They asked me for screenshot stories of these great mpg stories. So I did. The ONLY reason I purchased this Niro was the promise of 49 - 51 mpg in NE with regular gas. Kia finally did a 3 day long series of analysis/tests. Their results were the same as mine. Yes, driving under 55 mph does increase the mpg. But I drive 60 miles each way almost all interstate, 5 days a week. The typical speed on I80 for this stretch is 82-85 mph. No way can I drive 55 mph to get closer to their mpg Kia claimed, advertised and promised. Kia explained there are so many variables and that even in nice weather, I should expect 37-38 mpg on my interstate drive. And much less in winter. I was livid. If that’s the case, then Kia shouldn’t promise 49/51. Such a bait and switch. Felt like I’d been lied to. Then, over two years later, I’m finding improved mpg. 44-50 this summer, with hills, wind, driving 80 mph, ac on both sides, ethanol gas. It’s like after passing 55,000 miles/odometer, it finally started delivering near its promise. Still, I endured 2 years of disappointments, every excuse in the book, and much experimenting in how I drive, my speed, AC, heat, tires, cruise, etc. I have no idea if this better mileage will continue as the weather changes, but for now, I’m happier. However, next time around, I’ll be driving a Prius.
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post #24 of 32 (permalink) Old 08-16-2019, 10:10 AM
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Really? You expect 50 mpg driving over 80 mph? I'd be pretty happy to get 40 mpg at those speeds. You do know the EPA doesn't run at 80 mph to get their relative mpg figures?

I do have to say 28 mpg is low! But we have no idea where that number came from. Was it on the dash display after a 10 mile run in a headwind at 80 mph at zero degrees? Or was it a full tank where you calculated the mpg?
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post #25 of 32 (permalink) Old 08-16-2019, 11:50 AM
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Bad gas can cause MPG drops as well as carbon deposits in your engine. I'd run a couple tankfuls of top-tier gas if you haven't been doing that already and maybe pour in a can of seafoam or chevron techron for good measure.


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post #26 of 32 (permalink) Old 08-16-2019, 11:58 AM
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Originally Posted by Momwithaniro View Post
I got a 2017 Niro in May 2017. I live in NE. There are times in nice weather, w/o running AC or heat, I average as low at 28 mph, especially on longer drives. My first couple months I was getting 46-50 mpg. Then it changed in Sept. I started complaining 3 months after I bought it. They came up w/every excuse under the book: cheap gas, wind, hills, my driving, using cruise, not using cruise, driving over 55 mph. You name it, I heard it. I kept complaining with each oil change. ďIím reading Niro drivers in Wisconsin in winter with hills driving 75+ getting over 50. You promised me 49/51.Ē They asked me to keep track of my mileage and gas. So I did. They asked me to buy premium, so I did. They asked me for screenshot stories of these great mpg stories. So I did. The ONLY reason I purchased this Niro was the promise of 49 - 51 mpg in NE with regular gas. Kia finally did a 3 day long series of analysis/tests. Their results were the same as mine. Yes, driving under 55 mph does increase the mpg. But I drive 60 miles each way almost all interstate, 5 days a week. The typical speed on I80 for this stretch is 82-85 mph. No way can I drive 55 mph to get closer to their mpg Kia claimed, advertised and promised. Kia explained there are so many variables and that even in nice weather, I should expect 37-38 mpg on my interstate drive. And much less in winter. I was livid. If thatís the case, then Kia shouldnít promise 49/51. Such a bait and switch. Felt like Iíd been lied to. Then, over two years later, Iím finding improved mpg. 44-50 this summer, with hills, wind, driving 80 mph, ac on both sides, ethanol gas. Itís like after passing 55,000 miles/odometer, it finally started delivering near its promise. Still, I endured 2 years of disappointments, every excuse in the book, and much experimenting in how I drive, my speed, AC, heat, tires, cruise, etc. I have no idea if this better mileage will continue as the weather changes, but for now, Iím happier. However, next time around, Iíll be driving a Prius.
I'm not sure if you've owned a Prius before but as someone who owned several since 2004 I can say that you'll see the same thing happen with a Prius. In fact I'm very happy that my Niro gets about 2 mpg's better than my old 2012 Prius. I think when you watch your mpg's TOO closely you'll see some unexplained things that will make you nuts. My old Prius would generally get around 45mpg's when we lived in Pa. Sometimes after an oil change the mpg's would inexplicably go down in the high 30's. I would think the dealers used the wrong weight oil only in a few weeks the mpg's would go back up without any changes. Same when getting new tires. Sometimes mpg's would go down when you think they should go up and then in a few weeks go back to normal all by itself. So far my Niro hasn't shown any of this but it's still new (17,000 mi.) versus my last Prius had 166,000) when I traded it. I think you can't watch the mpg's super close, it'll make you crazy LOL.
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post #27 of 32 (permalink) Old 08-19-2019, 09:38 AM
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I'd say about 75-80F to be optimum temp for a Niro, at least mine seems to be. My 04 TDI it would have been about 65-70F. MOMWITHANIRO get yourself some sort of TDI and do 75-80mph and get about 44mpg winter or summer and hammering it passing and whatnot. Or get a Tesla if you can swing it, but a hybrid is the wrong choice for your type of commute. Trips under 5 miles are also devastating to miles per gallon especially in the winter. Two mile trip to Shop-Rite on a 10F day and you'll be lucky to get 28mpg.
To a lesser extent goes high temps. If your winter temps are in the 50s-60s then sure your winter mpg will be better. At over 100 degrees the battery efficiencies drop. The cooling system is running like mad(the other coolant reservoir) to keep the battery from melting. In Texas you're doing 85 in the slow Lane and with those dewpoints it's hard for any a/c to keep up.

As for losing mpg after an oil change I think you're gas tank is being poached and I'll double down on that bet if it's the same place you get tires.
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post #28 of 32 (permalink) Old 08-19-2019, 02:30 PM Thread Starter
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Update;

Since coming back to work from our summer break (I am a school bus driver), I have been driving with the A/C off and the windows open. I have been doing that because the A/C in my bus never cools the bus down when outside temps are over 85 degrees, and I get bad headaches by going in and out of air conditioned environments.

Currently after 47 miles on this tank of fuel, it is sitting at 66.4 mpg. This is with an ambient temp in the shade right now of 100 degrees. It just seems like, in this environment, running the A/C is a VERY large power drain.

Ohhh, I have also been driving around with my stereo cranked up too. On Friday I put my meter on my amplifier and it was putting out 53 volts of AC current at 2 ohms. That is a hair over 500 watts of power.
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post #29 of 32 (permalink) Old 08-19-2019, 04:40 PM
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Wow thats a big difference but there is no way I would do without the A/c I'm in Memphis pretty warm here too. But I'm at about 45 mpg with my Fuelly mostly highway miles so just about what Kia says I'll get so I'm happy. But I'm adding some Chevron Techron soon just for an experiment if it gets any better.

I usually kick A/c on high because its scorching hot for a few minutes then cut it down on 3 or 4 during the day. This is drivers only and set on low temp.
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post #30 of 32 (permalink) Old 08-19-2019, 08:58 PM
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I just drove my PHEV over the mountains and back today. Obviously I didn't get much help from the battery range. The MPG for the entire trip was a hair over 50 MPG. But that was crossing two different mountain passes (one lower than the other) in both directions. That kind of mileage, over mountains, at freeway speeds, and HVAC on, is more than satisfying.

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