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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > X Series > X3 F25 (2011 - current)

X3 F25 (2011 - current)
The latest X3 brings some added style and some new features to the BMW SUV family. Talk about the new F25 now!

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  #1  
Old 07-14-2013, 04:15 AM
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edbiology edbiology is offline
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Location: San Diego, CA, USA, Earth.
 
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Mein Auto: 2013 X3 28i
Jesus I got 34 mpg!!

Today for about 100 miles I was averaging 34 mpg!! My engine was already warm before I started the measuring. I was driving slow, 65 to 70 miles per hour due to some traffic on the highway. I notice as soon as I started to drive faster than 70 mph, the averaging begin to drop. It seems that the highway MPG is affected significantly by your highway speed. No wonder during my vegas/grand canyon trip I was only averaging 23 mpg, because I was driving 90 to 100 mph.

My car is 28i, has 17K miles as today.
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  #2  
Old 07-14-2013, 04:35 AM
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WHITEX WHITEX is offline
On our 2nd Alpine X
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Mein Auto: 06 X3/2010 MCSC
I'm jealous. I'd have to coast downhill in neutral to get that.
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GONE>>>Sold. One of the best rides I ever owned. My 1st BMW-2006 X3 3.0 White w/blk. Prem/Nav/Sirius/Servo/Heated seats,steering/Park Dist./Xenon/Privacy.I got the auto. trans. so my wife can drive it.
Our 2nd Bimmer2014 X3 i35 Alpine/Chestnut. Nav,Prem,Tech,Cold Weather, Shades. Got the Automatic cause we had no choice
My 1st Mini-2010 PW, I got the 6 speed so my wife can't drive it. Laurel Edition Convert
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  #3  
Old 07-14-2013, 06:19 AM
Fighterpilot Fighterpilot is offline
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26 has been the best we've had in terms of highway MPG, and that was in the 80 mph range and ECO Pro mode. Around town we can barely pull 20 mpg in ours x28i. Pretty disappointed.
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In garage - 2013 X3 x28i, Sport Activity, Convenience, Cold Weather I, and Premium Packages, Rear View Camera, Park Distance Control, Sat Radio, BMW Assist w/ Enhanced Bluetooth. Black Sapphire with Black Nevada seats.

Previous BMW's
2007 525i - Totaled -->http://www.bimmerfest.com/forums/sho...d.php?t=664410
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2009 535i - Totaled
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  #4  
Old 07-14-2013, 06:53 AM
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ponti33609 ponti33609 is offline
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Location: Tampa Florida
 
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Mein Auto: Moto Guzzi
Jesus I got 34 mpg!!

Quote:
Originally Posted by Fighterpilot View Post
26 has been the best we've had in terms of highway MPG, and that was in the 80 mph range and ECO Pro mode. Around town we can barely pull 20 mpg in ours x28i. Pretty disappointed.
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Everyone has a diff perspective for sure. We had a CR-V prior and our 35i gets the same mileage. I'm disappointed in the CRV not the X3.


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  #5  
Old 07-14-2013, 07:27 AM
captirwin captirwin is offline
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Location: Las Vegas, NV
 
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Mein Auto: 2013 X3 35i
I just returned from a round trip from Las Vegas to San Diego. 741 miles traveled. I averaged 24.9 mpg, including a little driving around San Diego.
I have a 2013 X3 35i.
I'm very satisfied with everything regarding the vehicle
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  #6  
Old 07-14-2013, 08:23 AM
The X Men The X Men is offline
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Quote:
Originally Posted by edbiology View Post
It seems that the highway MPG is affected significantly by your highway speed. No wonder during my vegas/grand canyon trip I was only averaging 23 mpg, because I was driving 90 to 100 mph.
Wind drag equals to the square of the speed you are traveling, therefore the difference of wind drag from 50mph to 100mph is four times as much.
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  #7  
Old 07-14-2013, 11:07 AM
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edbiology edbiology is offline
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Location: San Diego, CA, USA, Earth.
 
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Quote:
Originally Posted by The X Men View Post
Wind drag equals to the square of the speed you are traveling, therefore the difference of wind drag from 50mph to 100mph is four times as much.
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  #8  
Old 07-14-2013, 07:14 PM
RhoXS RhoXS is offline
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Quote:
Originally Posted by The X Men View Post
Wind drag equals to the square of the speed you are traveling, therefore the difference of wind drag from 50mph to 100mph is four times as much.
Its actually a lot worse than that.

The so called "Force of Drag", Fd, is indeed proportional to the square of the velocity. However, the power required to overcome the aerodynamic drag is proportional to the cube of the velocity. Therefore it actually takes nine times as much energy to say increase from 40 mph to 80 mph.

See the following link:

http://en.wikipedia.org/wiki/Drag_(physics)

The following quote is from this link.

"Note that the power needed to push an object through a fluid increases as the cube of the velocity. A car cruising on a highway at 50 mph (80 km/h) may require only 10 horsepower (7.5 kW) to overcome air drag, but that same car at 100 mph (160 km/h) requires 80 hp (60 kW). With a doubling of speed the drag (force) quadruples per the formula. Exerting four times the force over a fixed distance produces four times as much work. At twice the speed the work (resulting in displacement over a fixed distance) is done twice as fast. Since power is the rate of doing work, four times the work done in half the time requires eight times the power."
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  #9  
Old 07-16-2013, 07:56 PM
FomerZ3NowX3 FomerZ3NowX3 is offline
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Location: York, PA
 
Join Date: Jan 2010
Posts: 19
Mein Auto: 2013 X3 2.8i
Jesus I got 34 mpg!!

I picked up my 2.8i in April and have put just over 5k miles in a mixture of highway and suburban driving. My consumption via the computer seldom goes below 23 and averages well over 24 in my mixed driving. "Real" miles divided by gallons is usually about 3/4 mpg less than the computer.

I recently had a single day 300 mile interstate round trip with about 15 miles of pure urban driving in the middle. Sustained 75 mph on the highway, but "gentle" throttle to hold hills and move in and out of lanes. My "real" mpg was just shy of 30 and the computer showed over 31.

Am I happy? You bet!




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  #10  
Old 07-16-2013, 08:05 PM
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bighorns bighorns is offline
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Location: Hi Dez, California
 
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Mein Auto: E92 335i M Sport
Odyssey owners figured out that the gas mileage drops drastically after 78 MPH. What's the magic number on the X3?
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  #11  
Old 07-16-2013, 09:29 PM
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Keepittrill Keepittrill is offline
My avatar is a selfie LOL
Location: Phoenix
 
Join Date: Jun 2013
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Mein Auto: 2011 M3 DCT
Jesus I got 34 mpg!!

Quote:
Originally Posted by WHITEX View Post
I'm jealous. I'd have to coast downhill in neutral to get that.
"Coast downhill in neutral" I LOLd haha


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