[EdmM3]

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EPA Estimates (according to the EPA web site) are as follows:

2006 330i 21 mpg combined
2011 335i 22 mpg combined
2012 335i 26 mpg combined
2012 328i 28 mpg combined

Several questions.

1. Why the big jump in the 335i from 2011 to 2012. I can't believe the new transmission and a few other tweaks is enough to get an increase of almost 20%. Does anybody have any real world experience comparing the two cars.

2. Why only 2 mpg between 335i and 328i. Is this correct?

3. I personally get about 10% higher than EPA in my 330i. Are others getting higher than EPA in their f30s.


http://www.fueleconomy.gov/feg/Find....32175&id=30058

[bosz]

Originally Posted by EdmM3

EPA Estimates (according to the EPA web site) are as follows:

2006 330i 21 mpg combined
2011 335i 22 mpg combined
2012 335i 26 mpg combined
2012 328i 28 mpg combined

Several questions.

1. Why the big jump in the 335i from 2011 to 2012. I can't believe the new transmission and a few other tweaks is enough to get an increase of almost 20%. Does anybody have any real world experience comparing the two cars.

2. Why only 2 mpg between 335i and 328i. Is this correct?

3. I personally get about 10% higher than EPA in my 330i. Are others getting higher than EPA in their f30s.


http://www.fueleconomy.gov/feg/Find....32175&id=30058

I'd like to know this tooo...seems 328i with those turbo chargers guzzle more gas. Like really overworking a 4 cylinder = more gas consumption than we think

[RPM90]

Originally Posted by EdmM3

EPA Estimates (according to the EPA web site) are as follows:

2006 330i 21 mpg combined
2011 335i 22 mpg combined
2012 335i 26 mpg combined
2012 328i 28 mpg combined

Several questions.

1. Why the big jump in the 335i from 2011 to 2012. I can't believe the new transmission and a few other tweaks is enough to get an increase of almost 20%. Does anybody have any real world experience comparing the two cars.

2. Why only 2 mpg between 335i and 328i. Is this correct?

3. I personally get about 10% higher than EPA in my 330i. Are others getting higher than EPA in their f30s.


http://www.fueleconomy.gov/feg/Find....32175&id=30058

The auto trans does make most of the difference.
It has 2 over drive gears, which helps greatly.

If you look at the F30 manual trans 335i compared to the E90 335i MT, the MPG numbers are about the same. That makes sense considering the engines are the same, and the weight is about the same.
The drag coefficient is lower for the F30 compared to the E90, that will translate to better highway MPG for the F30, but to see that you need extended highway driving.
This decreased drag will surely help German drivers on the autobahn where speeds are quite high, which means great drag and the need for more power to keep moving. More power means burning more fuel.
Lower drag coefficient means the car can move through the air easier, thus requiring less fuel to maintain the same speed compared to the E90.

City driving difference won't be as great.
The N20 produces more hp and a good deal more torque. This torque is at maximum by 2000rpm. That means in city driving to get in and out of traffic, you'll be using that torque, and that will cost fuel as the N20 is producing more torque at a lower rpm. You can't produce more power and expect much less fuel usage. As city driving speeds, drag doesn't come in to play, neither does 2 over drive gears as the low city speeds will rarely get you into those gears, and if it does it won't be there for long to take advantage.

Keep your tires inflated to proper psi, and increase psi if you do a lot of highway driving. This will help MPG and it's an easy thing to do.

The difference between the N20 and N55 isn't that great because in city driving both engines will be producing about the same power when driven the same way. Both engines produce their max torque at very low rpm.
The N20 produces about 20lb ft less torque.
Dyno testing shows the N20 producing near 260lb ft AT THE WHEELS.
That means the actual torque being produced by the N20 is not that much less than the N55, whereas it was a big difference comparing the N55 to the N52.

The 328i and 335i models use the same 8spd auto with same gear ratio's and same final drive, also same body same drag. So the difference in MPG comes down to the 328's lower weight, and less power production overall. But, drive them the same way using same acceleration and the MPG difference comes down, and that's why the MPG difference between the 2 new 3's is not that large.

[pcbrew]

Any F30 owners with data on differences between Sport vs. Normal with 8AT?
I will likely drive in Spport most of the time and expect some difference with the different throttle & transmission programming and just wondering if anyone has any data points on what to expect.

[Xcution]

Originally Posted by bosz

I'd like to know this tooo...seems 328i with those turbo chargers guzzle more gas. Like really overworking a 4 cylinder = more gas consumption than we think

No they re-evaluated the 328i, it was higher, and they are currently working on the 335i numbers as well, it will go down.