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      06-24-2013, 11:09 AM   #89
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Quote:
Originally Posted by Grovsnus View Post
75 mph is also far above the maximum speed that the EPA tests are done with, and will incur higher fuel consumption than lower speeds. I'm surprised you got as good results as you did.

A non-car-specific EPA estimate is that if you get 32 mpg doing 50 mph, you'll only get 23 mpg doing 75 mph.
I think that's very old math. Many years ago, Road & Track calculated the ideal cruising speed for each car, based on drag coefficient, frontal area, gearing and the power curve. I used the calculated 72 mph for my CRX Si to justify plenty of speeding back in the day.

Having had access to a car fleet in Germany, I can say that an E39 525i got 22 mpg at 130+ mph and not much better when staying under that speed. It took ages to get there, but I was always surprised that it returned decent mileage at such high rpm. It would have never achieved over 30 mph like that chart shows, so the taper to 130 on that chart would have you expecting about 1 mpg at 130.
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      06-24-2013, 11:58 AM   #90
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Quote:
Originally Posted by Red Bread View Post
I think that's very old math. Many years ago, Road & Track calculated the ideal cruising speed for each car, based on drag coefficient, frontal area, gearing and the power curve. I used the calculated 72 mph for my CRX Si to justify plenty of speeding back in the day.
Consumer Reports tested a bunch of vehicles at different speeds too. It appears to corroborate the estimates of EPA.

I think that when the N20 can achieve as good numbers as 24-30 mpg doing 75 mph, and especially considering its larger air resistance, it goes to show how fuel efficient a car it really is.
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      06-24-2013, 12:02 PM   #91
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Quote:
Originally Posted by Grovsnus View Post
Consumer Reports tested a bunch of vehicles at different speeds too. It appears to corroborate the estimates of EPA.

I think that when the N20 can achieve as good numbers as 24-30 mpg doing 75 mph, and especially considering its larger air resistance, it goes to show how fuel efficient a car it really is.
My M Coupe got 28-30 mpg running between 80-85 mph consistently and might have returned over 26 mpg when running triple digit speeds, in theory at least...

Admittingly, it was 800 plus pounds lighter than the X1. I am impressed with the X1 nearly matching the highway efficiency of our previous N54 135i, up to about 85, where it does seem to start dropping off much more than the 1er did.
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      06-24-2013, 12:34 PM   #92
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Quote:
Originally Posted by Red Bread View Post
My M Coupe got 28-30 mpg running between 80-85 mph consistently and might have returned over 26 mpg when running triple digit speeds, in theory at least...

Admittingly, it was 800 plus pounds lighter than the X1. I am impressed with the X1 nearly matching the highway efficiency of our previous N54 135i, up to about 85, where it does seem to start dropping off much more than the 1er did.
Also, the M Coupe has lower air resistance (drag), which will be more of a factor at higher speeds.
Does it have the same twin scroll turbo, or is it a twin turbo? The latter may be more efficient at medium-rpm coasting, but burning more getting there.

I also found this, which has data from a 2009 study: http://cta.ornl.gov/data/tedb31/Edition31_Full_Doc.pdf
Page 118 (section 4-28) is the interesting one. As expected, it shows a larger drop in fuel economy for small SUVs than for "regular" cars as speed increases, and a drop from 34.3 mpg at 55 mph to 24.5 mpg at 75 mph. That's a quite significant difference.

When the esteemed poster here reported 24-30 mpg at 75.5 mph, I think the N20 X1 is rather impressive.
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      06-24-2013, 01:53 PM   #93
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The E84 is more of a car than an SUV, BMW even lists it that way on their monthly sales. While it's a little taller than your average car, it's much smaller than even the smallest of small SUV's.

My M Coupe was a Z3 E36/8 with a naturally aspirated, 3.2L I6. Here's something surprising:

E36/8 - cd of 0.37
E82 - cd of 0.31
E84 - cd of 0.32 - 0.34 depending on tires and trim

Interestingly, the much larger F25 X3 is also listed as 0.34 drag coefficient.

Our E82 had the same transmission but the older, less efficient N54 twin turbo motor, and routinely got 28-29 hwy mpg. Interestingly, it got about 16 city mpg while our E84 on the same cycles is returning around 17.5-18.0 mpg. Hwy mpg for the E84 is less than the E82, but still quite impressive. This is a mix of 7k ft city driving and hwy cruising at between 80-88 mph.


I also think the report you cited is of little value as only one of those cars, the Mountaineer is even remotely as torquey as the X1 and if I recall it had a pushrod V8 and certainly fewer than 8 gears in the transmission. German cars being geared for the autobahn typically have less of a drop off in higher speed efficiency as they're not being pulled out of their ideal power range when running in high gears, and the extra gears also significantly help out with hwy efficiency. That was primarily why I cited an older E39 getting 22 mpg while cruising at 130+, something not one of the cars in that study could do, regardless of mpg.
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      06-24-2013, 02:07 PM   #94
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Grovsnus, I'm really just typing to see the letters, not to argue with you. I don't think we're saying different things, just pointing out that the X1 is reasonably efficient for a relatively heavy and suitably powered car/suv.

Speed will unquestionably lower your efficiency, but I hold that it's a much smaller impact in a typical German car than it is in something like an F250 pickup or a sedan geared to only do 110 mph.
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      06-24-2013, 03:11 PM   #95
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Quote:
Originally Posted by Red Bread View Post
Grovsnus, I'm really just typing to see the letters, not to argue with you. I don't think we're saying different things, just pointing out that the X1 is reasonably efficient for a relatively heavy and suitably powered car/suv.

Speed will unquestionably lower your efficiency, but I hold that it's a much smaller impact in a typical German car than it is in something like an F250 pickup or a sedan geared to only do 110 mph.
I agree completely - I find the X1 to be very fuel efficient for its class - a performance crossover. The drag isn't bad at all for being taller, but it still costs some gas to keep a higher speed. I'm not sure about the N20, but the N55 seems to be most efficient when kept under 65 mph. But I don't worry much - it's still pretty efficient even when I step on it. Personally, I think the Valvetronic has something to do with the N55 being more efficient than the N54.

Speaking of the Mountaineer, I have one of the last 302cc V8 Mountaineers in my driveway, and it certainly does have a horrific profile. But it also has a lot of torque, and high momentum, so the drag isn't very noticeable. Well, a drop from 15 mpg to 14 mpg at speed, but who's counting
It's such a good workhorse that I just couldn't get rid of it.
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      06-24-2013, 04:35 PM   #96
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Quote:
Originally Posted by Red Bread View Post
My M Coupe was a Z3 E36/8 with a naturally aspirated, 3.2L I6. Here's something surprising:

E36/8 - cd of 0.37
E82 - cd of 0.31
E84 - cd of 0.32 - 0.34 depending on tires and trim

Interestingly, the much larger F25 X3 is also listed as 0.34 drag coefficient.
It's important to note that Cd is related to the shape of the vehicle. not necessarily the size. You also have to consider frontal area. Drag coefficient times frontal area equals drag area. So a small vehicle with a high Cd could have the same drag area as a large vehicle with a low Cd, and it's really the drag area that determines the "total drag".

It's quite possible for a large vehicle to have a lower Cd than a small vehicle (though most large vehicles happen to be kind of boxy and many small vehicles are aerodynamically shaped.)
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      06-24-2013, 04:42 PM   #97
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Quote:
Originally Posted by dgkli View Post
It's important to note that Cd is related to the shape of the vehicle. not necessarily the size. You also have to consider frontal area. Drag coefficient times frontal area equals drag area. So a small vehicle with a high Cd could have the same drag area as a large vehicle with a low Cd, and it's really the drag area that determines the "total drag".

It's quite possible for a large vehicle to have a lower Cd than a small vehicle (though most large vehicles happen to be kind of boxy and many small vehicles are aerodynamically shaped.)
Agreed, I was certainly simplifying things, but the M Coupe was not an aerodynamic car in any sense. But to your point the smaller size of the X1 compared to even the Cute Ute class will likely mean that it has significantly less overall drag than comparable SUV's and likely not much more than an E91 328iT. Add in the efficiency of the N20 combined with the ZF 8s and it really should have a sizable advantage against larger things like the Q5 and MLK.
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      06-24-2013, 10:34 PM   #98
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How's the tire pressure for you guys? I have to work hard to get under 30 mpg on the highway
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      06-26-2013, 03:48 PM   #99
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Our 2,0 Diesel Xline Xdrive has 1700miles on the clock and returned the above the other day with the Eco Program switched on a steady 60 mile round trip, well impressed
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      06-26-2013, 05:55 PM   #100
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Quote:
Originally Posted by Big Stew View Post
Our 2,0 Diesel Xline Xdrive has 1700miles on the clock and returned the above the other day with the Eco Program switched on a steady 60 mile round trip, well impressed
For the benefit of US readers, 62.7 mpg (UK) is 52.2 mpg (US).
If BMW modified it to run on the much lower grade US diesel, it would likely be around 45 mpg. Which is still impressive compared to most US cars, so it's a shame that there are so few diesel BMW models to choose from.

The flip side of the coin is that in the UK, there aren't a lot of petrol versions to choose from.
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      07-15-2013, 11:23 AM   #101
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does the car really perform better broken in? ....

Quote:
Originally Posted by Grovsnus View Post
Yes, mileage will go up. Not only because the car gets broken in, but because the driver gets broken in too. While a car is new (to you), it's tempting to step on it every now and then, without thought of how much that affects your mileage. (Drive aggressively for a mile at 10 mpg and another mile frugally at 50 mpg, and your average isn't 30 - it's 16 mpg.)

Sure, you can have fun with the car too, but be sure you don't measure the mileage in a way that includes the fun time.
My sales rep said that my 128i convertible would have better mileage once the engine has broken in, but by the time my lease was up, it was still doing about 12 liters/100 km (sorry, not good with the whole mpg and imperial system conversion). He sold me on the X1 based on the 4 cylinder engine being more fuel efficient, and I've had the X1 28i for 5 months now, and it's gone from 12.5 liters/100 km brand new to now averaging 11.7 liters/100 km.

I'm sure fuel efficiency gets worse with the sunroof and windows open, but what's the point of having them if not to use them!

Overall, I'm happier with this than the convertible, but bear in mind, the gas tank does hold 10 liters more in gas ... so is there really a savings?

I was really sold on the fuel efficiency of this car, and so far it hasn't really impressed me with THIS aspect of the car considering the advertising is for much lower than what I'm getting .... and when is my engine considered broken in? I have just over just under 6,000 km now?
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      07-15-2013, 01:31 PM   #102
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With the coatings in new engines, it won't be broken in until probably almost 20000km or so.
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      07-15-2013, 02:31 PM   #103
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I am curious to hear about gas mileage (fuel efficiency) from those living outside of the U.S. with their sDrive20i (petrol/gasoline operated engine).
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      08-13-2013, 10:43 AM   #104
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Quote:
Originally Posted by 1stone View Post
on my 2013 28i, I averaged 8.1 l/100 kms (29.03 mpg), approx 40% city and 60% Hwy. 115 km/h average speed on the hwy, 56 kmh overall average speed based on Onboard info. ECOPRO all the way. This is an average for 2000 kms, after the vehicle's first 2000 kms. (averaged 9 l/100 kms on its 1st 2000 kms)
I've had my Xi since february this year, and I'm only averaging 11.7 l/100km.

The road trip I last took was over 300km one way, but I only got 11.6 l/100km.

How do I get it down to 8.1 l/100km? I'd be happy to get it to 10 l/100km!
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      08-13-2013, 01:39 PM   #105
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Averaged 28.5 MPG (12.12 Km/lt.) on first gas tank. 75% highway / 25% city.
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      06-03-2014, 10:05 PM   #106
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1. How you drive affects your fuel consumption by a lot
2. Where do you drive often, highway or city
3. Traffic?

Drove BMW X1 sdrive 18i, just got in a month, at first I got 13L/100km (18.09 MPG US) on average, then I reset the counter and changed the way i drove to be more fuel efficient and now I am getting 11.2L/100km (21 MPG US)!

This is my first BMW so I'm not sure if its just X1 or BMW engineering in general, I noticed that X1 is really good at "gliding", and gets really fuel efficient when it reached > 50km (> 31 Miles), and on highway you could get much better millage. But when you are stuck in traffic that's when you are burning lots of fuel.

I reset my counter while i was in heavy traffic and got really bad mileage 39.5L/100km (5.95 MPG US), it was horrible.

Try changing the way you drive:
1. Gas slowly, better to gas while you are going down a hill than when you are going up. (do not overtake while going up a hill)
2. Try to "glide" as much as possible.

Good luck!
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      06-04-2014, 03:49 AM   #107
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2013 BMW X1  [10.00]
On a 5 day tour of Bavaria in "normal" mode we got 25.4 MPG. Not bad considering how much of the driving was on unrestricted Autobahns and in the mountains.
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      06-04-2014, 09:21 AM   #108
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Drove from NYC to Boston MA, 450 miles round trip, in a 2014 328i Xdrive, averaged 28.6mpg using comfort and sport mode, very spirited driving with radar detectors on all the time.
Drove from NYC to Cape Cod, MA, 480 miles round trip, in a 2014 X1 28i Xdrive, same route, same driving style, 19.9mpg.
Same engine, same transmission, and the X1 28i sucked big time compared to the 328i in fuel consumption. Both cars were equally fun to drive.
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      06-08-2014, 04:32 PM   #109
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ive 13 x1 2.8i x-drive and average about 26.6 city driving according to my mpg display
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      06-09-2014, 09:54 PM   #110
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fuel mpg

i have a 2013 x1 35i msport with 19" wheel option. about 11k miles on the car. i drive half conservative half aggressive, im avg 19-21 mpg all around. got as high as 26 on a trip to los angeles. mpg im not worried... this is a bmw. it puts a shit eating grin on my face everytime i get behind the wheel.
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