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Old 12-14-2012, 04:48 PM   #1
mutiger93gt
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Gas Mileage Decrease SFE vs. 17s

I have to say that Ford was probably correct on the differences in gas mileage. I get around 32.4MPG now with my OEM black/machined 17s versus the steel SFE wheels/covers. I was getting around 34.4 with my SFE stuff so that is about a 2mpg difference.


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Old 12-14-2012, 06:03 PM   #2
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Are the tires on the 17's low rolling resistance?
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Old 12-15-2012, 08:13 AM   #3
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I don't think so...they are just the oem tires that come on the 17s.
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Old 12-15-2012, 09:21 AM   #4
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You've got a few things working against you... 1. Weight difference. 2. Rolling resistance difference. 3. Aero difference.
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Old 12-15-2012, 09:47 AM   #5
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the factory 18s definitely aren't any better :P
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Old 12-15-2012, 09:51 AM   #6
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the factory 18s definitely aren't any better :P
No they are not. I am lucky to get 30 mpg mixed city/hwy with them.
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Old 12-15-2012, 09:55 AM   #7
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No they are not. I am lucky to get 30 mpg mixed city/hwy with them.
My average since I bought the car is 33.08 US mpg (7.1L/100km).. I put a set of 16" winter tires on for the colder months. I was hoping to average closer to 36 mpg like they advertised.. but apparently that's not going to happen :/ This is why I want a diesel.

I think when the PS3s wear out I'll try to find a set of 17s instead, just to help my fuel eco numbers.
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Old 12-15-2012, 12:01 PM   #8
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I lost all of 1 mpg when I went from the stock 16" SE Sport wheels to my 18" Sparcos...
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Old 12-15-2012, 01:08 PM   #9
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Quote:
Originally Posted by mutiger93gt View Post
I have to say that Ford was probably correct on the differences in gas mileage. I get around 32.4MPG now with my OEM black/machined 17s versus the steel SFE wheels/covers. I was getting around 34.4 with my SFE stuff so that is about a 2mpg difference.
That seems like a huge drop given the circumstances. Over how many tanks did you measure the fuel economy with each set of wheels? My mileage varies tank by tank between 31 and 36 mpg with no huge difference in driving habits. A 2 mpg difference in the short term can easily be explained by bad gas, change to winter blend, and a variety of other factors.

Plus if you notice the Cruze Eco and most hybrids out there use multi-spoke alloys so the SFE's flying saucer wheel covers really can't have any appreciable effect otherwise everyone would be using them.

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Are the tires on the 17's low rolling resistance?
I think it was Popular Mechanics that showed that LRR tires had little effect on mpg in controlled testing. I'm sure it varies by tire type and manufacturer though.

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You've got a few things working against you... 1. Weight difference. 2. Rolling resistance difference. 3. Aero difference.
I think I remember reading that the 17" alloys weigh roughly the same as the 16" steelies. No significant weight reduction with the 16's.

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My average since I bought the car is 33.08 US mpg (7.1L/100km).. I put a set of 16" winter tires on for the colder months. I was hoping to average closer to 36 mpg like they advertised.. but apparently that's not going to happen :/ This is why I want a diesel.

I think when the PS3s wear out I'll try to find a set of 17s instead, just to help my fuel eco numbers.
In the states with diesel costing almost 20% more than gas, diesel cars make little economic sense.
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Old 12-15-2012, 01:12 PM   #10
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In the states with diesel costing almost 20% more than gas, diesel cars make little economic sense.
I hate that, because diesel is cheaper than 87 gas up here... so it makes perfect sense. But since you Americans won't buy them, we Canadians suffer :( They're great for highway driving. The fuel eco numbers on the highway are phenomenal.
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