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F10 / F11 (2011 - Current)
The new chapter in the highly successful story of the BMW 5 Series Sedan (F10) and wagon (F11)

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  #1  
Old 02-28-2011, 11:58 AM
CRG CRG is offline
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Mein Auto: 2011 528i
MPG indicator

Over the last 10 fill ups, I calculated mpg the old fashion way and noted that the electronic indicator gave 1.5-2.0 mpg higher than my calculation (528i with 11k miles). Do I have a problem or is this error within normal range?
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  #2  
Old 02-28-2011, 02:45 PM
Emilner Emilner is offline
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My car has been almost dead on each time. Usually within .1-.2mpg. I typically reset the trip and mpg indicators each fillup and then calculate it using miles driven/gallons pumped...
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  #3  
Old 02-28-2011, 05:46 PM
Andrew OD Andrew OD is offline
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I have a 535 2011 and I calculated the miles per gallon and as you found it is consistently overly optimistic on the electronic calculated on the miles per gallon, in a range of 4 to 5%.
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  #4  
Old 02-28-2011, 06:25 PM
dunccfp dunccfp is offline
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Mine is dead on
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  #5  
Old 03-01-2011, 12:31 AM
BimmerUKF10 BimmerUKF10 is offline
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Maybe it's the fuel pumps that are out. People just assume they are calibrated and are accurate. I bet some aren't!
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  #6  
Old 03-01-2011, 02:03 AM
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johnbmw6 johnbmw6 is online now
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My gauge is within 0.5MPG which is very impressive, so far over 1550 miles in the 550i M Sport my PMG is between 26.6 and 28.6 MPG.
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  #7  
Old 03-01-2011, 07:18 AM
FPNY FPNY is offline
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so, how many miles to the gallon are we getting?
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  #8  
Old 03-01-2011, 08:26 AM
BimmerUKF10 BimmerUKF10 is offline
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I'm getting 30UK MPG with a 'very' combined cycle on my 535d. Get up to 38 MPG on a long run. Pretty impressive for a big powerful car, but a far cry from the BMW stated combined figure of 46MPG.
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  #9  
Old 03-02-2011, 12:31 PM
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MSgtMel MSgtMel is offline
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I take it that the 46mpg figure is corrected for the imp gal.? After all the imp is 25% larger than the U.S. gal, 5qt v. 4qt.
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  #10  
Old 03-02-2011, 01:45 PM
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johnbmw6 johnbmw6 is online now
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Quote:
Originally Posted by MSgtMel View Post
I take it that the 46mpg figure is corrected for the imp gal.? After all the imp is 25% larger than the U.S. gal, 5qt v. 4qt.
Not quite the difference between US gallons and UK gallons is 0.2 ; so 20 MPG US = 20* 1.2=24MPG UK
Or 24MPG UK = 24 / 1.2= 20MPG US
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  #11  
Old 03-02-2011, 08:01 PM
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MSgtMel MSgtMel is offline
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http://en.wikipedia.org/wiki/Gallon the table at the bottom of the page shows that the std. imp. gal is approx 4.546L and when converted to U.S. std is: 4.546 L = 4.80370 qt(US Liq) which for most purposes is close enough to 5qt U.S.

Looking at it another way the U.S. gal is .8 UK gal, diff of .2gal (UK); .2 = 20% = 1/5, pretty close to 1 more U.S. quart.
BTW .2 U.S. qt is about 6.4 U.S. oz (at 30 mpg U.S. is about 1.5 mi.) not even a full measure for any kind of drink (well not in most cases here any way) other than whiskey, which we won't go there.

Either way his mileage looks off, and hope it is something minor.
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  #12  
Old 03-03-2011, 01:36 AM
BimmerUKF10 BimmerUKF10 is offline
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Quote:
Originally Posted by MSgtMel View Post
http://en.wikipedia.org/wiki/Gallon the table at the bottom of the page shows that the std. imp. gal is approx 4.546L and when converted to U.S. std is: 4.546 L = 4.80370 qt(US Liq) which for most purposes is close enough to 5qt U.S.

Looking at it another way the U.S. gal is .8 UK gal, diff of .2gal (UK); .2 = 20% = 1/5, pretty close to 1 more U.S. quart.
BTW .2 U.S. qt is about 6.4 U.S. oz (at 30 mpg U.S. is about 1.5 mi.) not even a full measure for any kind of drink (well not in most cases here any way) other than whiskey, which we won't go there.

Either way his mileage looks off, and hope it is something minor.
I really don't think there is anything wrong with the car. My last vehicle was equally out on the quoted MPG numbers and it was an Audi. Same with anyone else I know who owns a car. Presumably cars are driven on a flat track to get the fuel economy figures. Either that or Germany is very flat! Maybe the American MPG quotes are leas optimistic than what we get in the UK. If they introduce the 535d over there it would be interesting to convert to litres and compare US with UK.
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  #13  
Old 03-03-2011, 10:38 AM
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MSgtMel MSgtMel is offline
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CRG, from past experience if your within 3mpg on the fill-up computation and what the cars meter says your most likely ok. You don't say how many miles are the car, again I've found that my new cars haven't gotten anywhere near EPA/car meter until they've been driven about 15K. WE all know how hopelessly optimistic EPA figures were until the recent change in their test protocols.

BimmerUKF10, I can't remember from my time at Woodbridge (East Anglia, Suffolk) in 90-92 if you folks have a similar (to the EPA) Gov. watch dog that dictates mileage figures and performance. Could it be that BMW used either the wrong standard to report mileage figures or louse up the calculation somehow? If the difference between sticker and actual was only a few gallon/mi. it could be written off to any of a number of possible idiosyncrasies. But at a difference of 8mpg, especially for a diesel it seems very odd to say the least.
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