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Old 02-15-2018, 11:12 AM   #1 (permalink)
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Kia Niro shows the importance of wheels on FE

MPG in Highway/City/Combined
Code:
Package		FE		LX		EX		Touring
16” wheels	52/49/50	51/46/49	51/46/49	-
18” wheels	-		-		46/40/43	46/40/43
Curb weight	3106		3199		3199		3287
Roof rails	No		Yes		Yes		Yes
Look at that FE drop from the 16->18" wheels!

The difference between the FE and LX seems to be about 100 lbs in weight, and roof rails.


Last edited by samwichse; 02-15-2018 at 11:18 AM..
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Old 02-15-2018, 12:01 PM   #2 (permalink)
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Wow, tables.

I'd be curious about the tire selection. Would a tall, narrow tire fit?
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Old 02-15-2018, 12:16 PM   #3 (permalink)
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Quote:
Originally Posted by samwichse View Post
... The difference between the FE and LX seems to be about 100 lbs in weight, and roof rails.
Neat! But ofcourse, it is probable that there are other differences too, such as fuel map and an aero package beyond just removing roof rails.
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Old 02-15-2018, 01:15 PM   #4 (permalink)
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Still, within the identical model, the fuel efficiency drops 13% for the big, non-aero wheels.

Side note, the FE/LX/EX wheels are, indeed, better aero than the Touring/18" EX wheels:
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Old 02-15-2018, 01:29 PM   #5 (permalink)
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Do you have the claimed top speeds for those models?

The more aerodynamic versions should have a higher top speed.



In Europe Dacia sells a hatchback car called the Sandero.

They also have a version called the Sandero Stepway which has bigger wheels and appears to be jacked up in the air slightly to give it a slight SUV look.

Interestingly, Dacia provides CDA data for these 2 versions, with the conventional hatchback coming in at 0.76 and the Stepway at 0.91.

Thats works out to be 19.7% extra aero drag for the Stepway.

Dacia charges an extra 1500 euro for the Stepway.

https://www.dacia.co.uk/vehicles/our...ml#grade-52B-1

https://www.dacia.co.uk/vehicles/our...52B-0|overview
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Old 02-15-2018, 02:28 PM   #6 (permalink)
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Quote:
Standard tire size for 2017 Kia Niro Hybrid Touring: P 225/45 R 18

Total wheel diameter (mm / in):660 / 26
http://www.automobile-catalog.com/tire/2017/2362820/kia_niro.html


http://ecomodder.com/forum/showthread.php/bridgestone-announces-large-diameter-narrow-tires-25208-4.html#post430127

so... 1 1/4" taller tire. You might need to add a boat tail to compensate.
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Old 02-15-2018, 04:38 PM   #7 (permalink)
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Quote:
Originally Posted by cr45 View Post
The more aerodynamic versions should have a higher top speed.
It may be easier to reach the top speed and sustain it, but if it retains the same gearing of the less aerodynamic versions it may not have a so noticeably higher top speed.
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Old 02-15-2018, 04:47 PM   #8 (permalink)
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As it's a hybrid, the top speed is probably electronically limited.
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Old 02-15-2018, 04:49 PM   #9 (permalink)
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Are there any other cars with such MPG discrepancies based on wheels alone? And do you know if this is just the company's estimate or if it was actually verified by the EPA? As far as I knew wheels only affected 1 mpg, at most 2, and that was regular wheels converted to solid caps (i.e. pizza pans).
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Old 02-15-2018, 05:00 PM   #10 (permalink)
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2017 EX: 47.6MPG average on Fuelly
Kia Niro EX MPG - Actual MPG from 75 Kia Niro EX owners

2017 Touring: 42.9MPG average on Fuelly
Kia Niro Touring MPG - Actual MPG from 29 Kia Niro Touring owners

Although weirdly, the FE is 45.2???
Kia Niro FE MPG - Actual MPG from 24 Kia Niro FE owners

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