320d m sport fuel/mpg issues???
Discussion
seraj1995 said:
... how many miles I am getting per half tank/full and the mpg that I’m getting. ...
You can't measure consumption by the "half tank". How do you know when the tank is half full? You just guess on the basis of what your fuel gauge shows but that will be a different amount each time. You need to do a brim-to-brim test and take note of the exact price of the petrol so that you can calculate the exact quantity used.From your description, I can't actually tell how much fuel you're putting it for how many miles.
Try properly FILLING it and then use it for a couple of weeks. When you next FILL it up, you can easily work out & report the proper fuel economy - although town driving & short trips are not good for fuel economy anyway, and a diesel probably won't even get up to optimal operating temp.
Try properly FILLING it and then use it for a couple of weeks. When you next FILL it up, you can easily work out & report the proper fuel economy - although town driving & short trips are not good for fuel economy anyway, and a diesel probably won't even get up to optimal operating temp.
seraj1995 said:
Locknut said:
You can't measure consumption by the "half tank". How do you know when the tank is half full? You just guess on the basis of what your fuel gauge shows but that will be a different amount each time. You need to do a brim-to-brim test and take note of the exact price of the petrol so that you can calculate the exact quantity used.
What do you mean by brim to brim? Nothing much wrong OP - you just aren't doing enough miles often enough to benefit from having a diesel. Good luck with your dpf BTW!
I had an E46 320td for 3 years and 42K miles - it averaged 47.8 mpg on the OBC.
Replaced it with a 123d that showed 48.7 mpg on the OBC after 6+ years and 81K miles.
Your fuel consumption would improve no end if you didn't use it for stop-start short trips.
I had an E46 320td for 3 years and 42K miles - it averaged 47.8 mpg on the OBC.
Replaced it with a 123d that showed 48.7 mpg on the OBC after 6+ years and 81K miles.
Your fuel consumption would improve no end if you didn't use it for stop-start short trips.
Going by your figures your getting approx 29mpg. It is a tad on the low side but not something to indicate there is something wrong.
I think you fell for the forum lies of MPG people get. One person comes on and says he managed to get 40mpg after their engine is full warmed up and going downhill.
Driving habits can be a huge influence. I think to get the MPG some people quote is enough to kill myself with the way you would need to drive.
Personally I would fill your tank and see how much it costs, do your normal driving you do until the range shows 10miles on it and then calculate what MPG you actually do mixed.
I think you fell for the forum lies of MPG people get. One person comes on and says he managed to get 40mpg after their engine is full warmed up and going downhill.
Driving habits can be a huge influence. I think to get the MPG some people quote is enough to kill myself with the way you would need to drive.
Personally I would fill your tank and see how much it costs, do your normal driving you do until the range shows 10miles on it and then calculate what MPG you actually do mixed.
Locknut said:
... take note of the exact price of the petrol...
No one has noticed my deliberate mistake! (I'm relieved)@OP: Brim-to-brim means that you fill the tank to the brim which is when the nozzle clicks off and take note of the mileage. Then you drive the car for a few hundred miles (how far is up to you). Then go back and fill the tank to the brim again. Now calculate the exact amount of fuel you have used, and calculate the mileage you have done, then divide the miles by the gallons to give the MPG. You can improve the accuracy by re-filling at the same pump with the car in the same position.
BTW: The on board computer is not accurate. Whenever I do a brim-to-brim I always find that my calculated MPG is 2 or 3 MPG lower than the on board computer.
Locknut said:
No one has noticed my deliberate mistake! (I'm relieved)
@OP: Brim-to-brim means that you fill the tank to the brim which is when the nozzle clicks off and take note of the mileage. Then you drive the car for a few hundred miles (how far is up to you). Then go back and fill the tank to the brim again. Now calculate the exact amount of fuel you have used, and calculate the mileage you have done, then divide the miles by the gallons to give the MPG. You can improve the accuracy by re-filling at the same pump with the car in the same position.
BTW: The on board computer is not accurate. Whenever I do a brim-to-brim I always find that my calculated MPG is 2 or 3 MPG lower than the on board computer.
Result! @OP: Brim-to-brim means that you fill the tank to the brim which is when the nozzle clicks off and take note of the mileage. Then you drive the car for a few hundred miles (how far is up to you). Then go back and fill the tank to the brim again. Now calculate the exact amount of fuel you have used, and calculate the mileage you have done, then divide the miles by the gallons to give the MPG. You can improve the accuracy by re-filling at the same pump with the car in the same position.
BTW: The on board computer is not accurate. Whenever I do a brim-to-brim I always find that my calculated MPG is 2 or 3 MPG lower than the on board computer.
Mind you my triple post did get spotted! 
The figures I quoted were from an Excel spreadsheet (I know, sad) but then they may not be totally accurate anyway as they are subject to the accuracy of the fuel pumps and the BMW mileage readings.
But regardless of that, a diesel isn't going to be noticeably more economical than a petrol for a 10 minute commute. If that is what the car is mainly used for a petrol might be a better idea - at least there is no danger of a DPF issue!
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