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      10-09-2008, 09:38 AM   #1
shmee150
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HUGE difference in economy around town v long distances

My previous car was a very slow, 1.2 petrol Renault Clio and the economy that managed was about 30mpg in town and 37-38 on long trips. All figures are UK gallons, so a bit different to US measurements.

Anywho my new 123d has been in town only for the 2 weeks I've owned it and I get around 30mpg again which was worrying me as it's significantly lower than I anticipated but I have now done a 200 mile motorway journey and I got 49.5mpg, driving around 80mph real speed most of the way, much more impressive! Anywho should I be surprised that it varies quite so much?

For those of you curious in general figures, using the display that tells you current mpg:

70mph in 6th - 65mpg
80mph in 6th - 60mpg

Tim
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      10-09-2008, 10:03 AM   #2
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I'm in the middle of an economy run at the moment. Trying to hyper-mile (drive as absolutely efficiently as possible) for a whole tank of diesel to see how close I can get to BMW's claims. Hard to say at this point how it will go but I was quite disappointed with the economy to date. I've only had the car for 3 weeks but I've done 2600kms and it is averaging 7.44 litres/100 kms (37.97mpg UK or 31.61mpg US).

I mostly drive in town with a short motorway stretch on my way to work. Traffic lights are killers for fuel economy

Will be very interested to see what I manage to get out of this VERY anally-retentively driven tank. You can see my figures here:
http://spreadsheets.google.com/ccc?k...wewyd_HNDcvCBw
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      10-09-2008, 10:45 AM   #3
adc
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So your new car with 75% greater displacement, forced induction, 50% more weight and more than double the power, driven at an undoubtedly faster pace - manages the same city mileage as your old car, yet you are not satisfied?

:iono:
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      10-09-2008, 11:04 AM   #4
shmee150
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Quote:
Originally Posted by adc View Post
So your new car with 75% greater displacement, forced induction, 50% more weight and more than double the power, driven at an undoubtedly faster pace - manages the same city mileage as your old car, yet you are not satisfied?

:iono:
Haha that's an interesting perspective.

Nah I was merely perlexed why it's gone from 30/38 to 30/50, rather than say 35/45, whatever the technical reason behind that actually is. For interest, a much much faster pace 0-30 in what 3.1 they say I think, stupid speed limits.

Tim
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      10-09-2008, 12:14 PM   #5
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it's pretty simple actually, It takes a lot more energy to get the car moving from a stop, then to keep it moving when it's already going. My m3 is the same, I get 15-20 mpg around town and then 28-30 on the highway, so you should be very happy with the results
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      10-09-2008, 12:17 PM   #6
shmee150
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Quote:
Originally Posted by NickmanM3 View Post
it's pretty simple actually, It takes a lot more energy to get the car moving from a stop, then to keep it moving when it's already going. My m3 is the same, I get 15-20 mpg around town and then 28-30 on the highway, so you should be very happy with the results
That makes sense, thanks
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      10-09-2008, 12:52 PM   #7
jkp1187
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I really hate the fact that we can't get the 123d in the US.
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      10-10-2008, 02:22 PM   #8
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The car is heavy as well. Moving that weight from a dead stop takes a lot of fuel. Hence, city mileage is crappy.

I do wish we could get a 123D hatchback though. That would be nice to get 60mpg.
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