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Confused about Diesel Fuel Consumption

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Old 12-08-2006, 02:57 AM
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Originally Posted by aybeesea' post='364548' date='Dec 7 2006, 10:41 AM
Purely from a naivety perspective I would expect to get poorer consumption with the "more powerful" engine.

ABC
In general you would think that was true, but with cleverer delivery of fuel, you often get both performance and economy gains. The two engines in question also moved from a cast iron block to a magnesium block so the whole car should be lighter as a result.
Old 12-08-2006, 03:07 AM
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Originally Posted by E60_530D' post='364925' date='Dec 8 2006, 11:57 AM
The two engines in question also moved from a cast iron block to a magnesium block so the whole car should be lighter as a result.
Weight difference is 20kg (45 lbs). Over 1650 or so for total weight, I doubt you'd notice. Some options would add more weight than that, never mind passengers.
Old 12-09-2006, 01:51 PM
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Be aware of the effects of the cold weather? Are both figures recent? Have both mpg trips been reset and covered similar mileages in similar weather conditions?

My 520d mpg has dropped off quite dramatically as the colder weather has hit, particularly when being used only for short trips. Avg was around 44mpg, it's now running at 36!

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