Fuel Mileage affected by 20"s

rxb2138 · 08-05-2006, 01:03 PM

Hey guys, just wondering if any other owners experience a 5-7 MPG drop after putting 20's on their 330i.

I realize there is more unsprung weight and requires more torque to move the wider tires. etc....

Any thoughts?

bavarian19 · 08-05-2006, 01:44 PM

I wouldnt be surprised...

MIKEYMIKE · 08-05-2006, 01:48 PM

Quote:

Originally Posted by rxb2138

Hey guys, just wondering if any other owners experience a 5-7 MPG drop after putting 20's on their 330i.

I realize there is more unsprung weight and requires more torque to move the wider tires. etc....

Any thoughts?

My 20 inch DPE's actually felt considerably lighter than my 162's with RFT's when we were switching them out.

However, the rotational mass of the 20's is greater than 18's. My gas mileage has dropped about 2 mpg city driving.

rxb2138 · 08-05-2006, 04:35 PM

Quote:

Originally Posted by MIKEYMIKE

My 20 inch DPE's actually felt considerably lighter than my 162's with RFT's when we were switching them out.

However, the rotational mass of the 20's is greater than 18's. My gas mileage has dropped about 2 mpg city driving.

What are you getting in the city/highway w/ the 20's?

MIKEYMIKE · 08-05-2006, 05:44 PM

Quote:

Originally Posted by rxb2138

What are you getting in the city/highway w/ the 20's?

First off, my MPG is really bad because I do 95% city driving and lots of short distances like 6 miles to work, 2 miles to school, etc....

Before the 20's I was getting like 20-21 MPG

After the 20's I'm getting 18-19 MPG

330i 6mt, btw.

MIKEYMIKE · 08-05-2006, 05:47 PM

BTW,

If you do go with 20's...or any sized wheels for that matter just make sure they aren't heavy. I think more unsprung weight plays a larger role in killing performance than rotational mass.

On my last car I had 20 inch chrome wheels that were MAD HEAVY on my g35 (don't make fun of me, chrome was popular back then lol).

Once I took them off my car gained like 7 mpg better and it felt like my car gained 50 horsepower. I feel like the weight on the wheels was the killer more than anything.

strykr · 08-05-2006, 06:29 PM

I get anywhere from 24-26 mpg ever since I put my 20s on. It was the same when I had my stock 16s on.

MIKEYMIKE · 08-05-2006, 06:55 PM

Quote:

Originally Posted by strykr

I get anywhere from 24-26 mpg ever since I put my 20s on. It was the same when I had my stock 16s on.

Do you do a lot of Highway driving? I suspect this is the case, but I could be wrong.

bobnaz · 08-06-2006, 05:34 PM

Quote:

Originally Posted by MIKEYMIKE

First off, my MPG is really bad because I do 95% city driving and lots of short distances like 6 miles to work, 2 miles to school, etc....

Before the 20's I was getting like 20-21 MPG

After the 20's I'm getting 18-19 MPG

330i 6mt, btw.

Does the tire height mess with the true reading of the odometer...would that make your gas mileage better or worse

BeeEmDubU · 08-06-2006, 06:54 PM

what aobut gas mileage from 16 to 19?

lux.sh · 08-06-2006, 07:37 PM

Quote:

Originally Posted by MIKEYMIKE

I think more unsprung weight plays a larger role in killing performance than rotational mass.

its just as bad.

NaTuReB0Y · 08-06-2006, 07:52 PM

my 20s averaged 24.6 city/hwy.............27.5 all hwy

lux.sh · 08-06-2006, 10:08 PM

cause natureboy drives like a grandma.

Pretender · 08-07-2006, 06:13 AM

I used to get 320-340 miles/tank. With my new wheels, I never get more than 290 miles. That's 3mpg loss.

rxb2138 · 08-07-2006, 11:44 AM

Quote:

Originally Posted by Pretender

I used to get 320-340 miles/tank. With my new wheels, I never get more than 290 miles. That's 3mpg loss.

Ditto...I am getting around 300 mi. per tank, and that's with 70% highway driving. I have slushbox, and I have found I get a little bit better mpg in sport mode.

icewatersoda · 08-07-2006, 02:09 PM

Im in the 18.5mpg range. Im only at 3k miles.

08-05-2006, 01:03 PM	#1
rxb2138 Enlisted Member 4 Rep 34 Posts Drives: Still Looking Join Date: Jul 2006 Location: TX iTrader: (0)	Fuel Mileage affected by 20"s Hey guys, just wondering if any other owners experience a 5-7 MPG drop after putting 20's on their 330i. I realize there is more unsprung weight and requires more torque to move the wider tires. etc.... Any thoughts? __________________ Retired 2008 550i, 2006 M Roadster, 2006 330i, 2002 M Coupe, 1996 328i, 2009 Z4 S35
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08-05-2006, 01:44 PM	#2
bavarian19 General 558 Rep 18,849 Posts Drives: Car Join Date: Mar 2005 Location: VA iTrader: (23)	I wouldnt be surprised...
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08-05-2006, 05:47 PM	#6
MIKEYMIKE Lieutenant Colonel 69 Rep 1,516 Posts Drives: 330i 6mt Join Date: Oct 2005 Location: SoCal iTrader: (3)	BTW, If you do go with 20's...or any sized wheels for that matter just make sure they aren't heavy. I think more unsprung weight plays a larger role in killing performance than rotational mass. On my last car I had 20 inch chrome wheels that were MAD HEAVY on my g35 (don't make fun of me, chrome was popular back then lol). Once I took them off my car gained like 7 mpg better and it felt like my car gained 50 horsepower. I feel like the weight on the wheels was the killer more than anything.
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08-05-2006, 06:29 PM	#7
strykr Private First Class 2 Rep 111 Posts Drives: 06 325i Join Date: Aug 2005 Location: socal iTrader: (0)	I get anywhere from 24-26 mpg ever since I put my 20s on. It was the same when I had my stock 16s on.
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08-06-2006, 06:54 PM	#10
BeeEmDubU Captain 18 Rep 718 Posts Drives: AW 325i Join Date: Apr 2006 Location: So Cal iTrader: (2)	what aobut gas mileage from 16 to 19?
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08-06-2006, 07:52 PM	#12
NaTuReB0Y Powered By 36DD 378 Rep 7,369 Posts Drives: 2006 E90 Join Date: Jul 2005 Location: Inland Empire iTrader: (12)	my 20s averaged 24.6 city/hwy.............27.5 all hwy __________________ 2006 E90 330i Jet Black \| 20" WORK VS-XX \| FK452 \| H&R Sport on Koni Yellow \| REMUS QUAD
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08-06-2006, 10:08 PM	#13
lux.sh missing two turbos. 631 Rep 4,859 Posts Drives: fast around corners. Join Date: Sep 2005 Location: Curves iTrader: (12) Garage List 2006 BMW E90 330i [7.00]	cause natureboy drives like a grandma. __________________ 06 AW E90 330i ZPP/ZSP/Step/Expired Warranty : Prior Design Front : ACS Rear : ACS Roof : BlackLines : Simota Intake : Carbon Fiber Interior Trim : : MTEC V3 : 24% Charcoal : V1 Hardwired : Solaris Invisibulbs/LED interior :
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08-07-2006, 06:13 AM	#14
Pretender Colonel 159 Rep 2,419 Posts Drives: 06 330i, 07 328i, 16 X1, >17M2 Join Date: Aug 2005 Location: Bay Area, CA iTrader: (1) Garage List 06 330i [0.00]	I used to get 320-340 miles/tank. With my new wheels, I never get more than 290 miles. That's 3mpg loss. __________________ It's a great time to be alive
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08-07-2006, 02:09 PM	#16
icewatersoda Private First Class 22 Rep 158 Posts Drives: Black on Black E90 Join Date: May 2006 Location: Sun Daygo!!!!!!!!!!!! iTrader: (3)	Im in the 18.5mpg range. Im only at 3k miles. __________________ 2006 325i Jet Black (5-21-06)
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