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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > 17" vs 18" Wheels and Fuel Mileage



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      11-08-2012, 08:42 PM   #1
GreekboyD
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17" vs 18" Wheels and Fuel Mileage

In the summer on my 18" wheels I'd be getting 7.5L/100 km or 31.4 mpg. Now with my 17" winter wheels I'm getting 5.4L/100 km or 43.5 mpg. This is highway mileage that I'm talking about.

It must be the tire size?
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      11-08-2012, 09:17 PM   #2
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Could be wheel weight or tire compound too.
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      11-09-2012, 07:28 AM   #3
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Could be wheel weight or tire compound too.
These winters are heavier for sure, both wheels and rubber.
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      11-09-2012, 07:45 AM   #4
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Probably tire size causing the error but that's a significant difference.
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      11-09-2012, 08:11 AM   #5
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I believe its the tire size
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      11-09-2012, 08:27 AM   #6
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Tell us the tire sizes and let's use our collective brain power to figure this out! (uh oh)

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      11-09-2012, 01:26 PM   #7
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Tell us the tire sizes and let's use our collective brain power to figure this out! (uh oh)




Summer:

235X40X18 - front

265X35X18 - rear

Winter:

225X45X17 all around
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      11-09-2012, 01:58 PM   #8
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Not enough to explain the discrepancy. I suspect sampling error.
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      11-09-2012, 02:32 PM   #9
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I have the same setup...

Maybe the colder air results in a mileage decrease? I thought the colder air was
'denser' and provided a better mixture (at least for gassers...) - what about
for oil burners?


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      11-09-2012, 03:05 PM   #10
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Most places also have a 'winter blend' that (from memory) supposedly reduces fuel economy. Don't know if that might contribute too?
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      11-09-2012, 03:24 PM   #11
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Originally Posted by DieselDiner
Most places also have a 'winter blend' that (from memory) supposedly reduces fuel economy. Don't know if that might contribute too?
My fuel economy has improved in the colder weather and after the winter tires went on. Weird.
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      11-09-2012, 03:40 PM   #12
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The difference could be a combination of lower rolling resistance, lower air resistance, higher air pressure, different diameter, and change in driving style. Dunno.

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      11-09-2012, 04:35 PM   #13
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Quote:
Originally Posted by GreekboyD View Post
In the summer on my 18" wheels I'd be getting 7.5L/100 km or 31.4 mpg. Now with my 17" winter wheels I'm getting 5.4L/100 km or 43.5 mpg. This is highway mileage that I'm talking about.

It must be the tire size?
My D uses 17" for both normal and Winter tires and I do not have any difference in FE which averages out at 7.6 L/100 KM with a best tank average of 6.7 L/100 KM.

What is your range per tank (KM travelled per tank)?

What speed are you cruising to get 5.4 L/100KM?

When I drive on the 400 series in Toronto it is impossible to drive below 120 KM/Hr and in most instances I am driving at 140 KM/Hr which is why my average fuel consumption is around 7.6 L/100KM.
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      11-09-2012, 07:22 PM   #14
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http://www.caranddriver.com/features...d-tires-tested

Some interesting stuff in there that relates to your question.
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      11-09-2012, 10:03 PM   #15
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Yup. In addition to the car and driver article there was a truck comparison a few years back. The results showed that by going from stock to larger wheels the truck lost 2 secs 0-60!

From personal experience, my LR3 lost a little over 3 mpg just going to a little larger tire!
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      11-10-2012, 06:54 PM   #16
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Are you going by the digital gauge or actual odometer reading based on fill up to depletion? Digital can be very off.
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      11-10-2012, 07:43 PM   #17
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225 is likely the biggest effect, but there is something going on more than just that...probably driving habits and average speeds, as well.

In the summer, I average ~7.2-7.5 mixed with 235/255 18's. So far, I see 6.9-7.3 with the winters and similar driving habits. 235/255 > 225 is a noticeably narrower width and likely influences consumption.

The only way I ever get into the 5.3-5.6 range is by driving at or below 100km/h...not a very easy thing to do in this car.

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