26mpg... is that normal for a 35d?

[Georgepascal]

I m averaging around 26mpg and i wonder if that is normal or not. I just bought the X6, its a 2008 model & it has 9500miles on it. No messages, alerts for errors etc, according to the service records, no service made so far....
Note: i ve checked the psi, was 2.6 in all four tyres and i correct it to 2.0psi..

[JOHNBMWM5]

In a word NO, unless you are town diving all the time, I average 31MPG going up too 35/37 touring, mine has been bought new and now I have 7800 miles covered, seems to get better with miles. My tyre pressures are fronts 36PSI, rears 40PSI, hope this helps, check them once a month.

[chuck92103]

When referencing MPG, please note imperial or U.S. gallons.

The X5 diesel is rated at 28MPG highway in the U.S. Our EPA estimates are conservative in most cases so the X5 diesel should hit 30-31MPG highwar in real life, add 20% more for imperial gallon conversion.

To me, 26MPG seems realistic for imperial gallons. It really depends how you drive.

[rsyed]

i think 26 amazing - i am expecing 12l/100km in the city for my 35d, that equates to 23 mpg (imp)....

[Deda]

13,2 litres per 100km..all in city with 21 inches wheels!

[Georgepascal]

ok guys... it seems that something s going wrong either with my car or my driving 'style'. But I ve got one more question to try and sort things out:
Do you reset the computer every time you start the engine and then you read the outcome at the end of your trip? My 35d gives 26mpg but i never reset the computer since the 1st day i got it...

[Deda]

well you can reset computer and drive it until you burn first tank and then check again...but normal result is around 13 liters!

[rsyed]

Originally Posted by Georgepascal

ok guys... it seems that something s going wrong either with my car or my driving 'style'. But I ve got one more question to try and sort things out:
Do you reset the computer every time you start the engine and then you read the outcome at the end of your trip? My 35d gives 26mpg but i never reset the computer since the 1st day i got it...

again - 26 mpg is amazing. you should not be complaining - be happy

[chuck92103]

Originally Posted by Georgepascal

ok guys... it seems that something s going wrong either with my car or my driving 'style'. But I ve got one more question to try and sort things out:
Do you reset the computer every time you start the engine and then you read the outcome at the end of your trip? My 35d gives 26mpg but i never reset the computer since the 1st day i got it...

The most accurate way to measure MPG is to fill the tank and reset the trip meter.

When you fill up again, divide the gallon purchased into the miles on the trip meter.

Don't trust the computer. It is fairly accurate but shows MPG over time unless reset.

[xDrive50i]

There should be two indications for mpg. The computer will keep track of one that it has accumulated since the first time your car was driven and the other is one that you can reset at any given time. The one that the computer always keeps will show you the mpg for overall performance and will include any driver and any driving style. This is your TRUE mpg performance indicator.

[chonko]

Originally Posted by chuck92103

The most accurate way to measure MPG is to fill the tank and reset the trip meter.

When you fill up again, divide the gallon purchased into the miles on the trip meter.

Don't trust the computer. It is fairly accurate but shows MPG over time unless reset.

The problem with that is that the volume of petrol or diesel you fill your tank is susceptible to temperature variation.Sometimes, it will take 22 gallons to fill your tank and some other time, it might be less or more depending on atmospheric conditions.
The computer is actually accurate because it delivers the fuel to the cylinders at a given pressure, and because of this, it can accurately compute how much fuel is consumed.
With regards to resetting the mpg everytime you fill your tank- that is the best thing to do to get an appropriate usage per tank.

[xDrive50i]

Originally Posted by chonko

The problem with that is that the volume of petrol or diesel you fill your tank is susceptible to temperature variation.Sometimes, it will take 22 gallons to fill your tank and some other time, it might be less or more depending on atmospheric conditions.
The computer is actually accurate because it delivers the fuel to the cylinders at a given pressure, and because of this, it can accurately compute how much fuel is consumed.
With regards to resetting the mpg everytime you fill your tank- that is the best thing to do to get an appropriate usage per tank.

+1

In addition to that, unless you ALWAYS use the exact same gas station and the exact same pump to get your gas, there is no guarantee that you will end up with the same amount of gas. Some pumps start to count before it even comes out of the end of the hose, but will stop counting the second you cut it off. And who knows how 'accurate' the pump actually is. Just do a Google search and you can find all kinds of interesting articles from gas station all over the place that were scamming consumers out of gas by having the counter run faster than the actual gas pumped, etc.

In regards to the temperature variation you mentioned, every pump has a sticker that states what the volume is equalized to. Funny thing is that you hardly ever have that as an ambient temperature

[chonko]

Originally Posted by xDrive50i

+1

In addition to that, unless you ALWAYS use the exact same gas station and the exact same pump to get your gas, there is no guarantee that you will end up with the same amount of gas. Some pumps start to count before it even comes out of the end of the hose, but will stop counting the second you cut it off. And who knows how 'accurate' the pump actually is. Just do a Google search and you can find all kinds of interesting articles from gas station all over the place that were scamming consumers out of gas by having the counter run faster than the actual gas pumped, etc.

In regards to the temperature variation you mentioned, every pump has a sticker that states what the volume is equalized to. Funny thing is that you hardly ever have that as an ambient temperature

You are absolutely right, they used to post the calibration parameters before (temp and pressure) on the pumps. It is a hard press to find them on the pumps these days. I noticed the ones in Canada still post the temp and pressure under which the pumps are calibrated

[mkaresh]

Originally Posted by chuck92103

When referencing MPG, please note imperial or U.S. gallons.

The X5 diesel is rated at 28MPG highway in the U.S. Our EPA estimates are conservative in most cases so the X5 diesel should hit 30-31MPG highwar in real life, add 20% more for imperial gallon conversion.

To me, 26MPG seems realistic for imperial gallons. It really depends how you drive.

Anyone know which the BMW trip computer is using outside the US? Cyprus was under British control at one point, so maybe Imperial?

TrueDelta has a Gas Mileage Survey that includes more variables than most, and that performs a three-way unit conversion. Only response response for the X6 so far, and that one for the TT gas engine.

Real-world BMW X6 gas mileage

More for the X5--diesel is at the bottom:

Real-world BMW X5 gas mileage