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I guess diesel is not a panacea either...

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ZipSpeed said:
Is it me or does diesel smell 10x as strong and bad during the cold season?
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Gas exhaust does too. I think it has something to do with the Air itself. Possibly the Cold, but could be due to other things such as lack of Pollen and/or other substances more common during Warm periods.
 
PricklyPete said:
I have driven a lot of diesel engines over the years...and actually just drove my friend's X5 diesel that he picked up a week ago. For commuter cars or SUV/trucks...I'm all about them...but in anything remotely sporty...I'd much prefer a gas engine.
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Those X5 diesels have been selling like hotcakes (relatively speaking). With the torque it is almost as fast as a 4.8L (definitely faster off the line), and gets 27mpg. I wish it came sooner. The only negatives I've seen are the clattering engine noise and garage smell. Even the 335d is the one to get right now.
 
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rh71 said:
Those X5 diesels have been selling like hotcakes (relatively speaking). With the torque it is almost as fast as a 4.8L (definitely faster off the line), and gets 27mpg. I wish it came sooner. The only negatives I've seen are the clattering engine noise and garage smell. Even the 335d is the one to get right now.
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Have they been selling well...I wasn't under that impression...but that is awesome if they are. I definitely want BMW/Audi to bring more of those options over.
 
ExarKun333 said:
More misinformation. Diesels do indeed have 25-35% more ENERGY per gallon, but take about 25% more oil to make that gallon. The oil needed to make disel competes with industrial and heating needs as well.

Diesel is really only 5-10% more efficient, but you often have collateral costs such as more expensive engines and increases in diesel costs due to competing industries.
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no.

gas engines are about 25% efficient. diesels are typically about 35%. if you think that is only a ten percent different in efficiency, you suck at math. (hint: ten is forty percent of twenty-five)
 
brblx said:
no.

gas engines are about 25% efficient. diesels are typically about 35%. if you think that is only a ten percent different in efficiency, you suck at math. (hint: ten is forty percent of twenty-five)
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LOL. That's because there is more to life than grabbing figures you don't understand and comparing them. The reason the percentages "don't add up to you" is because the real efficiency advantage of diesels in real-world use us really only about 5-10%. Yes, the engine is more efficient (about 40%) from idle to ~1900RPM, but efficiency drops more quickly than gasoline as the RPMs increase. Gas, conversely, is less efiicient at slower speeds, but can meet or exceed diesel at higher RPMs (usually translating into higher speeds).

Right now, the average cost of gasoline in the US is 2.629 and the average cost of diesel is 2.790. That is over a 6% premium on diesel, which counteracts much of the said advantage.
 
diesel is more expensive than gas because we refine less of it. what we do refine, we do inefficiently, and some of it probably gets exported in exchange for imported gasoline (only guessing on that last one). iirc there's this thing called supply and demand.

and that's ignoring the fact that if we put the money into biodiesel production that we have ethanol, we would have or at least be on the path to cheaper diesel.

also, quotes (those little tick marks you sandwich words between) are for things that people actually said. please cram your condescension firmly inside your anus.
 
Fenixgoon said:
considering the US has stricter emissions policies than europe it wouldn't be nearly the problem...
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All measurements in Grams/Mile,
: ULEV2 : EURO 5(Diesel) : Euro 5 (Gasoline)
CO: 1.7 : 0.8 : 1.6
NOx: 0.05: 2.88 : 0.096
HC: 0.008: 0.368 :0.16
PM*: 0.01 : 0.008 :0.008

*Particulate Matter

just looked up the numbers, but keep in mind emissions testing doesn't apply in a lot of states (18 have testing, according to wikipedia) while all EU member states must have biannual testing.


the major problem with diesel vehicles are particulate emissions, mainly that as injection pressures inrease and the size of each droplet of fuel injected decreases, the size of particulates become so small that they can directly cross cell membranes and cause all sorts of fun things like alzheimers and heart disease. Larger, visible particulates tend to be caught by the lungs and don't cause much damage, but no one wants to see that cloud of black smoke, amirite?
 
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