Dunlop SP Winter Sport 3D

boi222 · 12-30-2009, 12:10 AM

225/45R17 Dunlop SP Winter Sport 3D Blackwall
17X8 Rial Salerno Silver Painted
35psi front/ 36 psi rear

I have installed the above winter configuration and my mpg has dropped drastically, i am averaging about 10mpg (mix between city and highway driving but mainly city). I have averaged 15-18mpg on the OEM summer tires. Is this normal to drop so drastically? I installed these myself, could I have installed the tires wrong? any help would be greatly appreciated. =)

thanks.

BMdblU · 12-30-2009, 12:39 AM

10MPG is pretty drastic, even with xdrive and all city driving. That's V10 M5 mileage.

Winter tires tend to run 'heavy' and usually you will lose some mileage, but not what you're talking about. Try a fresh tank of gas and see what happens.

Ron1n · 12-30-2009, 12:51 AM

You will also lose some mileage as a result of the cold weather in general, due to the denser air.

boi222 · 12-30-2009, 08:49 AM

thanks... would cold weather give 10mpg? i still think thats pretty drastic, but can't figure out what could be wrong. the car is driving fine otherwise. i was just worried, i may have installed my tires wrong.

Gary@TireRack · 12-30-2009, 09:01 AM

Nothing you could have done with those wheels and tires would result in a 30%+ drop in fuel economy. Driving on snow or slush covered roads does cause much greater rolling resistance, regardless of tire type. Perhaps that was a factor?

boi222 · 12-30-2009, 10:15 AM

thanks gary. nope. no more snow here. its cold, (like 23°) but no snow... oh well, my concern was putting the tires on wrong since this was my first time changing tires on a car, but if your saying this has nothing to do with that...i can live with the lower mpg. thx

Ph0zenstone · 12-30-2009, 10:40 AM

get your foot checked out if you're only getting 10mpg.

02themax · 12-30-2009, 12:45 PM

Wow I have the same tires and average about 17-19mpg in the snow? Are your tires backwards??

boi222 · 12-30-2009, 01:16 PM

how do i check if its on backwards? I installed them with the rotation -> pointing to the front of the car. Is that correct? what do you keep your tire pressure at?

Firefly6 · 12-30-2009, 01:52 PM

Over how many miles did you calculate this? Was it under the same conditions, speed etc. as with the other tires?

boi222 · 12-30-2009, 02:09 PM

the lastest calculation was done over 60 miles. if i gradually go from 0 to 40 mph... i am seeing the mpg as 6mpg.... i dont remember what it was b4 but i am pretty sure it wasnt this low

Ph0zenstone · 12-30-2009, 02:15 PM

wow thats def a problem, i only see 6mpg on the gauge cluster when i am flooring it or driving it hard

stressdoc · 12-30-2009, 03:03 PM

To assess fuel efficiency you need constant conditions. I use 75 mph cruise control on the same stretch of highway. Summer tires mpg = 31.2; Winter tires mpg = 29.8. So there is a difference for me.

boi222 · 12-30-2009, 04:59 PM

does anyone think its because of my tire pressure? i am using the recommend tire pressure on the door sticker...but that was for 18" rft...im using 17" non-rft

zzzbullseye · 12-30-2009, 05:42 PM

Quote:

Originally Posted by boi222

does anyone think its because of my tire pressure? i am using the recommend tire pressure on the door sticker...but that was for 18" rft...im using 17" non-rft

I would think the only way pressure would have that much of an effect would be if it was drastically low.

thkfast · 12-30-2009, 10:43 PM

The first thing I notice during winter is the BLACK soot in my exhaust tips. My mechanic friend advised that's because during winter, the car simply runs richer and doesn't get the chance to warm up. I'm averaging 17 mpg during winter months. Pump up the air pressure to maximum recommendation and accept the decrease in winter mpg. No biggie.

Ihatewinter

Gary@TireRack · 12-31-2009, 11:32 AM

Directional tires installed backwards would not affect MPG much at all.

DJKhan85 · 12-31-2009, 11:47 AM

I'm running the same tires as the OP on different rims. I did NOT notice a decrease in MPG at all. Somethings definately wrong to get that low. Maybe you are using more gas pedal than normal?

BTW i'm using the same tire pressures as well.

02themax · 12-31-2009, 08:46 PM

Maybe fill up your tank with fresh gas, reset your trip computer and report back.

boi222 · 01-01-2010, 01:42 PM

im puzzled now...i'll try the new tank of gas....could I have receive defective tires?

02themax · 01-01-2010, 04:05 PM

I don't think its the tires, sounds more like a mechanical issue like your brakes are sticking or your fuel system? Might be time to take it in if the trip reset and new fuel dont do the trick. GL

Park2670 · 01-01-2010, 05:33 PM

Same tires, stock pressures, only dropped 1-2 mpg. Mostly due to the cold weather here.

12-30-2009, 12:10 AM	#1
boi222 Captain 199 Rep 691 Posts Drives: 2021 X3m competition Join Date: Jun 2007 Location: NYC iTrader: (0)	Dunlop SP Winter Sport 3D - decrease mpg? 225/45R17 Dunlop SP Winter Sport 3D Blackwall 17X8 Rial Salerno Silver Painted 35psi front/ 36 psi rear I have installed the above winter configuration and my mpg has dropped drastically, i am averaging about 10mpg (mix between city and highway driving but mainly city). I have averaged 15-18mpg on the OEM summer tires. Is this normal to drop so drastically? I installed these myself, could I have installed the tires wrong? any help would be greatly appreciated. =) thanks. __________________ '24 X5M Comp '21 X3M Comp '18 M3 Comp '15 M4 coupe '12 M3 coupe
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12-30-2009, 12:39 AM	#2
BMdblU Brigadier General 153 Rep 3,983 Posts Drives: F80 Join Date: Oct 2007 Location: Toronto iTrader: (2)	10MPG is pretty drastic, even with xdrive and all city driving. That's V10 M5 mileage. Winter tires tend to run 'heavy' and usually you will lose some mileage, but not what you're talking about. Try a fresh tank of gas and see what happens.
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12-30-2009, 12:51 AM	#3
Ron1n Speed Demon 218 Rep 3,690 Posts Drives: 2021 M5C Join Date: Oct 2009 Location: Irvine iTrader: (6) Garage List 2021 M5 Competition [0.00] 2016 BMW 550i [0.00] 2011 335is [0.00] 2009 E93 M3 [10.00] 2010 335d [9.50]	You will also lose some mileage as a result of the cold weather in general, due to the denser air. __________________ Current: '21 M5C, '15 X6 50i Previous: '18 M550i, '16 550i, '11 335is, '09 E93 M3 DCT, '10 E90 335d, '07 E90 328i
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12-30-2009, 08:49 AM	#4
boi222 Captain 199 Rep 691 Posts Drives: 2021 X3m competition Join Date: Jun 2007 Location: NYC iTrader: (0)	thanks... would cold weather give 10mpg? i still think thats pretty drastic, but can't figure out what could be wrong. the car is driving fine otherwise. i was just worried, i may have installed my tires wrong. __________________ '24 X5M Comp '21 X3M Comp '18 M3 Comp '15 M4 coupe '12 M3 coupe
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12-30-2009, 09:01 AM	#5
Gary@TireRack Moderator 372 Rep 4,742 Posts Drives: Formerly 1995 M3 Join Date: Oct 2006 Location: South Bend, IN, Tire Rack HQ iTrader: (2)	Nothing you could have done with those wheels and tires would result in a 30%+ drop in fuel economy. Driving on snow or slush covered roads does cause much greater rolling resistance, regardless of tire type. Perhaps that was a factor? __________________ Gary. Tire and Wheel Forum Moderator. Tire Rack Sales Rep Gary@Tirerack.com http://www.tirerack.com/a.jsp?a=AH8&url=index.jsp Please refer to 'Gary/E90 Post' as your previous contact when you order online to help support this forum.
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12-30-2009, 10:15 AM	#6
boi222 Captain 199 Rep 691 Posts Drives: 2021 X3m competition Join Date: Jun 2007 Location: NYC iTrader: (0)	thanks gary. nope. no more snow here. its cold, (like 23°) but no snow... oh well, my concern was putting the tires on wrong since this was my first time changing tires on a car, but if your saying this has nothing to do with that...i can live with the lower mpg. thx __________________ '24 X5M Comp '21 X3M Comp '18 M3 Comp '15 M4 coupe '12 M3 coupe
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12-30-2009, 10:40 AM	#7
Ph0zenstone Major General 332 Rep 5,370 Posts Drives: 2018 530e X-Drive Join Date: Apr 2007 Location: NY iTrader: (74)	get your foot checked out if you're only getting 10mpg.
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12-30-2009, 12:45 PM	#8
02themax Captain 28 Rep 946 Posts Drives: E90 335i Join Date: Apr 2008 Location: Calgary, AB iTrader: (6)	Wow I have the same tires and average about 17-19mpg in the snow? Are your tires backwards?? __________________ E90 335i Sport Package - Logic 7 Sound w/ipod - Bluetooth - Comfort Access - PDC - 19" M3 Reps 275/30 235/35 - Blacklines - 10mil spacers rear, 5mil spacers front - BMW Alarm
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12-30-2009, 01:16 PM	#9
boi222 Captain 199 Rep 691 Posts Drives: 2021 X3m competition Join Date: Jun 2007 Location: NYC iTrader: (0)	how do i check if its on backwards? I installed them with the rotation -> pointing to the front of the car. Is that correct? what do you keep your tire pressure at? __________________ '24 X5M Comp '21 X3M Comp '18 M3 Comp '15 M4 coupe '12 M3 coupe
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12-30-2009, 01:52 PM	#10
Firefly6 Lieutenant 13 Rep 412 Posts Drives: 2018 330i Xdrive Join Date: Aug 2007 Location: New Jersey iTrader: (2)	Over how many miles did you calculate this? Was it under the same conditions, speed etc. as with the other tires?
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12-30-2009, 02:09 PM	#11
boi222 Captain 199 Rep 691 Posts Drives: 2021 X3m competition Join Date: Jun 2007 Location: NYC iTrader: (0)	the lastest calculation was done over 60 miles. if i gradually go from 0 to 40 mph... i am seeing the mpg as 6mpg.... i dont remember what it was b4 but i am pretty sure it wasnt this low __________________ '24 X5M Comp '21 X3M Comp '18 M3 Comp '15 M4 coupe '12 M3 coupe
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12-30-2009, 02:15 PM	#12
Ph0zenstone Major General 332 Rep 5,370 Posts Drives: 2018 530e X-Drive Join Date: Apr 2007 Location: NY iTrader: (74)	wow thats def a problem, i only see 6mpg on the gauge cluster when i am flooring it or driving it hard
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12-30-2009, 03:03 PM	#13
stressdoc Moderator 656 Rep 10,863 Posts Drives: BMW i8; Toy 4runner TRD pro Join Date: Jun 2005 Location: Waco TX iTrader: (0)	To assess fuel efficiency you need constant conditions. I use 75 mph cruise control on the same stretch of highway. Summer tires mpg = 31.2; Winter tires mpg = 29.8. So there is a difference for me. __________________ My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808 my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279
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12-30-2009, 04:59 PM	#14
boi222 Captain 199 Rep 691 Posts Drives: 2021 X3m competition Join Date: Jun 2007 Location: NYC iTrader: (0)	does anyone think its because of my tire pressure? i am using the recommend tire pressure on the door sticker...but that was for 18" rft...im using 17" non-rft __________________ '24 X5M Comp '21 X3M Comp '18 M3 Comp '15 M4 coupe '12 M3 coupe
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12-30-2009, 10:43 PM	#16
thkfast Major 263 Rep 1,028 Posts Drives: 2015 F82 M4 Sakhir Orange DCT Join Date: Mar 2009 Location: Cedar Rapids, IA iTrader: (1)	The first thing I notice during winter is the BLACK soot in my exhaust tips. My mechanic friend advised that's because during winter, the car simply runs richer and doesn't get the chance to warm up. I'm averaging 17 mpg during winter months. Pump up the air pressure to maximum recommendation and accept the decrease in winter mpg. No biggie. Ihatewinter __________________ "The likelihood of one individual being right increases in direct proportion to the intensity with which others attempt to prove him wrong." 2015 F82 M4 - Sakhir Orange Metallic 2013 E92 M3 / 2013 E92 335is / 2010 E90 335i / 2007 E90 335i
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12-31-2009, 11:32 AM	#17
Gary@TireRack Moderator 372 Rep 4,742 Posts Drives: Formerly 1995 M3 Join Date: Oct 2006 Location: South Bend, IN, Tire Rack HQ iTrader: (2)	Directional tires installed backwards would not affect MPG much at all. __________________ Gary. Tire and Wheel Forum Moderator. Tire Rack Sales Rep Gary@Tirerack.com http://www.tirerack.com/a.jsp?a=AH8&url=index.jsp Please refer to 'Gary/E90 Post' as your previous contact when you order online to help support this forum.
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12-31-2009, 11:47 AM	#18
DJKhan85 Major 24 Rep 1,190 Posts Drives: 2011 4dr 6mt Golf GTI Join Date: Jun 2009 Location: Boston Massachusetts iTrader: (1)	I'm running the same tires as the OP on different rims. I did NOT notice a decrease in MPG at all. Somethings definately wrong to get that low. Maybe you are using more gas pedal than normal? BTW i'm using the same tire pressures as well. __________________ 2011 VW GTI 4dr-6mt-Sunroof-Nav-Xenons OLD: 08 335i AW/CR/Poplar 6mt-ZSP-ZPP-ZCW-iPod-iDrive-PDC-Style 230s w/FK 452-Dinan LSD
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12-31-2009, 08:46 PM	#19
02themax Captain 28 Rep 946 Posts Drives: E90 335i Join Date: Apr 2008 Location: Calgary, AB iTrader: (6)	Maybe fill up your tank with fresh gas, reset your trip computer and report back. __________________ E90 335i Sport Package - Logic 7 Sound w/ipod - Bluetooth - Comfort Access - PDC - 19" M3 Reps 275/30 235/35 - Blacklines - 10mil spacers rear, 5mil spacers front - BMW Alarm
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01-01-2010, 01:42 PM	#20
boi222 Captain 199 Rep 691 Posts Drives: 2021 X3m competition Join Date: Jun 2007 Location: NYC iTrader: (0)	im puzzled now...i'll try the new tank of gas....could I have receive defective tires? __________________ '24 X5M Comp '21 X3M Comp '18 M3 Comp '15 M4 coupe '12 M3 coupe
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01-01-2010, 04:05 PM	#21
02themax Captain 28 Rep 946 Posts Drives: E90 335i Join Date: Apr 2008 Location: Calgary, AB iTrader: (6)	I don't think its the tires, sounds more like a mechanical issue like your brakes are sticking or your fuel system? Might be time to take it in if the trip reset and new fuel dont do the trick. GL __________________ E90 335i Sport Package - Logic 7 Sound w/ipod - Bluetooth - Comfort Access - PDC - 19" M3 Reps 275/30 235/35 - Blacklines - 10mil spacers rear, 5mil spacers front - BMW Alarm
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01-01-2010, 05:33 PM	#22
Park2670 General 361 Rep 18,218 Posts Drives: Tesla Model 3 Join Date: Jan 2006 Location: UTAH iTrader: (8)	Same tires, stock pressures, only dropped 1-2 mpg. Mostly due to the cold weather here. __________________
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