[Mr.E92]

This car is great when it comes to highway milage I can easily see mid 20's-30's

Right now .... I'm getting between 18-19MPG according to the computer (90% City Driving)

[sle39lvr]

I am so glad this thread was posted.

I just got a CPO 328i as well. It's also doing low MPG, 21-23mpg for the first couple of tanks I got with about 80% city driving as OP. This got just under 50k miles as well. Just as the OP, I do have exhaust residue, more or so than other cars, which I am not very happy about (I will post pics soon as well).

I, for a fact, know that this car should get around 25mpg regular city in Florida. No hills, good, straight roads. 28-31 Should be highway gas mileage. So I don't know those of who gets less than 20, there's def. something wrong with the way you drive, even if your hard on it.

I am a little worried about this situation as well, but I've been told, down here, always use Mobil or Chevron 93 Octane gas. Shell seems to have higher ethanol concentration comparatively? This is what I've been told by few people. And, I have been using Shell 93 all this time.

I talked to the dealership regarding this and since they have a complete record of my car, it has a perfect history (recent oil change, wheel balance, alignment, etc with new tires. However, they suspect that the previous owner might have put low quality gas in it from the symptoms I am explaining to them. So they asked me to try the fuel addictive that BMW sells. They also pulled the line that says that this is summer and it's lower than usual, but it should not matter THAT much.

So I am going to try the fuel additive, Mobil or Chevron 93 Gas. Also, I guess the car will learn my driving style and all that.... since mine is an auto. I will report in few weeks and let you guys know. Meanwhile, crossing my fingers

[sle39lvr]

Just under 50K miles.

[sle39lvr]

I've been told to use BMW's OEM Gas Additive (Part# 82140413341)

I am going to try this over couple of tanks and see. Hopefully some improvement...

[sle39lvr]

Ok, It's been awhile, and to update:

Tried few things, yet no mentionable improvement.
- I tried BMW additive, about 3 tanks. No improvement.
- Put a K&N, throttle lag is now minimum, probably improved the mpg by .5; not enough.
- Been using Chevron and Mobil 92 oct.

My city mpg is 18-20. This is fairly in stop and go traffic, yet more than 50% smooth, straight roads without and stops.

However, I noticed this: I have stock 16" alloys. They have nitrogen filled in them, yet my Speedometer is off. Since the diameter of these are smaller, when I do 60 mph, I am actually doing about 55-56 according to several GPS's. So the wheels are turning more than due to smaller diameter. So could this also offset my mpg? May be the car is ACTUALLY doing 22-24mpg, but since the speedometer is off, it's calculating wrong?

Anyone here has 16"s and gets mid 20's for city?

[sle39lvr]

Got new plugs few weeks ago. Now I get 22-24 with 80% city driving. Though some might call this normal, I still feel that this needs to be better.

I am trying BMW additive 2-3 times per oil change.
Should I try the dealer injector cleaner service?
Throttle body clean up?
What else can I try?

[berserkerx]

Going easy on the throttle and cut down on any idling. Go to Fuelly.com and look at the tips on there if you need to get better economy.

These cars don't do that well in the city unless you're really easy on the throttle. I mean with just the car alone you are pushing around 3400 pounds roughly.

[Route 16]

Bought my 328i 3 months ago, previous owner had 41mpg, don't know his driving methods, wish I did. With stock everything 25mpg 90% highway 65mph cruise, 10% doing errands, I would get 420-430mpg on Chevron 91oct. At start up one time, I had 503mpg on one full tank.

Installed eisenmann full exhaust and k&n cone intake last week, 400-410mpg, 24.7mpg, still driving 90% highway 65mph cruise. 10% doing errands and DS mode and semi-manual at stop light roads.

I know I can do better mileage if my foot wasn't tempted to hear my expensive investment on sound.

Future hopeful to improve gas:
lowered suspension, wrapping exhaust headers with exhaust wrap, BMW PI or eurobox, AA tune.

[tibra1]

Originally Posted by sle39lvr

Got new plugs few weeks ago. Now I get 22-24 with 80% city driving. Though some might call this normal, I still feel that this needs to be better.

I am trying BMW additive 2-3 times per oil change.
Should I try the dealer injector cleaner service?
Throttle body clean up?
What else can I try?

Can I ask you something the money your are spending trying to make this car more fuel efficient,..is it worth it?

I mean I bought brand new and havent gotten better than 15mpg city since day 1..but its ok...I drive the thing like I stole it so I know better...

If you are hell bent on fuel economy is this the right platform for you...maybe a diesel/ hybrid...just saying

[sle39lvr]

I AM going very easy on the throttle. Doing my best to see what the car can do.

[sle39lvr]

Originally Posted by tibra1

Can I ask you something the money your are spending trying to make this car more fuel efficient,..is it worth it?

I mean I bought brand new and havent gotten better than 15mpg city since day 1..but its ok...I drive the thing like I stole it so I know better...

If you are hell bent on fuel economy is this the right platform for you...maybe a diesel/ hybrid...just saying

I understand your point. However, in the past I have had heavily modded cars and have gotten way past posted mpg. When I drive for fun I drive like other's here, but everyday work/errands, I want the car the be efficient.

If the car is not getting at least the posted mpg with my driving, I know there is something else going on with it. That's what I am trying to find out.

If you are getting 15mpg..why not drive a V8? why not get way more power? I know what your answer will be, but I was just going along with the same mentality as your question...in a way a good question...

[berserkerx]

Originally Posted by sle39lvr

I understand your point. However, in the past I have had heavily modded cars and have gotten way past posted mpg. When I drive for fun I drive like other's here, but everyday work/errands, I want the car the be efficient.

If the car is not getting at least the posted mpg with my driving, I know there is something else going on with it. That's what I am trying to find out.

If you are getting 15mpg..why not drive a V8? why not get way more power? I know what your answer will be, but I was just going along with the same mentality as your question...in a way a good question...

What kind of heavily modded cars ate you meaning? I mean even with my evo if I kept my foot out of it which was hard to do I did well with gas mileage. But damn when I was rough on it I was rough on it. Like a 14 gallon tank getting me like 176 miles.

Are you an xi? I mean that would be an issue for getting good mileage as well. I just think these cars are heavy. I can tell you right now that if you're in an area where you are using air conditioning in these cars it kills mileage worse than other cars I have driven.

I do have to say though how long is it going to take you to pay yourself back with all the money you have put into it?

[sle39lvr]

Originally Posted by berserkerx

What kind of heavily modded cars ate you meaning? I mean even with my evo if I kept my foot out of it which was hard to do I did well with gas mileage. But damn when I was rough on it I was rough on it. Like a 14 gallon tank getting me like 176 miles.

Are you an xi? I mean that would be an issue for getting good mileage as well. I just think these cars are heavy. I can tell you right now that if you're in an area where you are using air conditioning in these cars it kills mileage worse than other cars I have driven.

I do have to say though how long is it going to take you to pay yourself back with all the money you have put into it?

So far $60 for plugs.
It's not an Xi.

[berserkerx]

Originally Posted by sle39lvr

So far $60 for plugs.
It's not an Xi.

How many miles are on the car? I am still curious what cars you had that were heavily modified? I mean were they modified along with losing a lot of weight?

[sle39lvr]

Originally Posted by berserkerx

How many miles are on the car? I am still curious what cars you had that were heavily modified? I mean were they modified along with losing a lot of weight?

49K now on the car.

I had couple of VW's (1 turbo) and a Japanese car before that. About 15 year range here we are talking about. Not THAT heavy modding where gutting out the car...

[just4kickz]

Originally Posted by FrankE90xi

ur lucky my car reads 15 mpg but i drive like a complete asshole 24/7 on the highway i get 28 tho

haha


15 is pretty hard to get... im driving like 90% city 10% highways but whenever i get on the highways i shift at like 5k. 18.2mpg right now

[nycbr]

I have an XI and a heavy foot. I get about 17 mpg in the city. I get about 25 mpg on the highway, but that could be better if I could keep it under 80.

[Glim]

Originally Posted by sle39lvr

However, I noticed this: I have stock 16" alloys. They have nitrogen filled in them, yet my Speedometer is off. Since the diameter of these are smaller, when I do 60 mph, I am actually doing about 55-56 according to several GPS's. So the wheels are turning more than due to smaller diameter. So could this also offset my mpg? May be the car is ACTUALLY doing 22-24mpg, but since the speedometer is off, it's calculating wrong?

Our speedometers are purposely set to read 5% higher than true speed.

You can enable the digital velocity in the dash that shows true speed:

http://www.e90post.com/forums/showthread.php?t=327056

[sle39lvr]

I had a loaner 328i for few days now. Same exact trim as my own. This is a 2011 with under 10K miles. I do the same weekly routine, this thing does 2-3mpg higher in city, 1-2mpg better on highway. I wonder if LCI remapped the computer....

[m@rco]

Low 20's for city traffic is not unusual. I used to get around 24mpg in and around Houston regardless of outside temperature or 87, 89, or 91 octane numbers. Fuel additives also didn't seem to help.

On highway trips, the car does much better. When sticking to the speed limit of 75mph, 31.5mpg is doable. And since the fuel consumption is a function of the square of the velocity...

[J3NGOe90]

20mpg in the city not baddd

[sle39lvr]

Just to give another update:

Few weeks ago, I got the "Service Engine Soon" Light:
Code was something to do with Vanos. Dealer cleaned them. I am unto 24-25 where I used to get 20-22. Highway trips give me 29-31 now. See I told you guys there was something wrong before