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      09-17-2013, 07:49 PM   #1
ssmith96
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Gas Mileage is Horrible... Please Help

Hey Everyone

First of all I have searched, and I can't seem to get a good consensus, so I'm putting it out there to see if I can get some help.

I have an 07 328xi with 81k on it. I drive mostly to school and home and around town, 80% suburban driving. I am averaging 12.8mpg. I took out and cleaned my MAF and as of now I'm up to 13.6mpg. However it almost seems like I'm using more gas for whatever reason... (I'm at 3/4 of a tank now, and have driven 50 miles according to the trip computer since last fill up, so 200 miles per tank seems low, I thought I was getting 240ish per tank)

Anyway, can anyone think of why this might be so poor? Is that just how it is? I've been only using 93 octane gas since I got the car, and I have run Jectron cleaner through once in the 7k miles I've owned the car. Right now I'm filling up once a week and I would really like to cut that down to every 1.5 weeks.

Thanks a ton
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      09-17-2013, 07:50 PM   #2
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drive slower? you should be getting at least 15-16 city if you dont floor it everywhere.
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      09-17-2013, 07:52 PM   #3
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I've been intentionally driving very conservatively. I can't seem to get anything higher then 12mpg on the needle until I'm in 4th gear or higher
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      09-17-2013, 07:58 PM   #4
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Couple of things come to mind:
- check/replace air filter
- replace spark plugs
- check air pressure in tires
- don't drive it too aggressively if you are

Not sure if having an AWD on an E90 could be factor vs a non-AWD. Have you done an oil change and if so, what oil are you using?
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      09-18-2013, 10:19 AM   #5
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Quote:
Originally Posted by jbnery6465 View Post
Not sure if having an AWD on an E90 could be factor vs a non-AWD.
It's certainly a factor that would contribute to worse gas mileage compared to a non AWD E90, but the effect is not nearly significant enough to account for the OP's terrible gas mileage.
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      09-18-2013, 10:37 AM   #6
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Try resetting your cars computer, and then see what MPG you get. Our MPG in Germany was around 17mpg most of the time running at high speeds but since we have returned to the states the avg is 23mpg. Still not great but okay!

Last edited by Speedwagon; 09-18-2013 at 10:42 AM.
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      09-18-2013, 10:39 AM   #7
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Try resetting your cars computer, and then see what MPG you get.
+1

Also, if you reset your trip counter at your previous fill up, do a manual calculation at your next fill up.
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      09-18-2013, 10:45 AM   #8
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You said you cleaned your oxygen sensor and gas mileage went up slightly, they tells me it has something to do with that and probably needs to be replaced.
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      09-18-2013, 11:00 AM   #9
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The only thing I have ever noticed with the 335i is that when the air filter was around 29k, my mileage was dipping 1-1.5 mpg on the exact same commute. It took me 3 wks to notice the pattern. New air filter instantly restored the mpg. But we're talking 19 vs. 21.7.

I did an experiment and replaced an air filter at 10k--there was no difference.

What you should do to get an instantaneous indication of where you are, is to accelerate onto the highway, reach about 65 mph, set your cruise. Now reset your mpg computer, and drive at least 10 miles without releasing the cruise, 30-50 miles would be even better. If you don't get 28-32 mpg, something is very wrong. You want to remove the stop and go element from your calculation. If you're driving in the city and stopping for every light, you could get poor mpg when there's nothing wrong with the vehicle.
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      09-18-2013, 11:03 AM   #10
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Wow that sucks, I have a 335i and I drive it HARD all the time and I still average 18 mpg city
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      09-18-2013, 11:03 AM   #11
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Even in stop and go traffic i still get 17 mpg in my 335
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      09-18-2013, 11:28 AM   #12
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I have a 07 328xi and I have been having the same problem. My gas mileage isn't as bad as your, its around 16-17 city which I think is prety low. Highway is about 28 which I think should be higher. I would try what the guy said about going on the highway, putting the car on cruise at 65 mph and resetting your mpg.
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      09-18-2013, 11:33 AM   #13
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Quote:
Originally Posted by John 070 View Post
What you should do to get an instantaneous indication of where you are, is to accelerate onto the highway, reach about 65 mph, set your cruise. Now reset your mpg computer, and drive at least 10 miles without releasing the cruise, 30-50 miles would be even better. If you don't get 28-32 mpg, something is very wrong. You want to remove the stop and go element from your calculation. If you're driving in the city and stopping for every light, you could get poor mpg when there's nothing wrong with the vehicle.
+1

If you're able to do this on part of the freeway that doesn't have any steep inclines or declines, that would be better as the incline/decline would definitely skew your MPG.
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      09-18-2013, 11:39 AM   #14
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It's more likely a bad sending unit in the tank and you have more in there than you think. The dealer can runa test plan to check it. If the car really was getting that poor of economy you would have more issues.
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      09-18-2013, 11:49 AM   #15
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It's more likely a bad sending unit in the tank and you have more in there than you think. The dealer can runa test plan to check it. If the car really was getting that poor of economy you would have more issues.
Wow, you're saying his mpg calculation is based on how many miles he's driven, how many gallons fit in a tank, and doing the division?

That's nuts. BMW assumes that Americans can do math, and it couldn't be further from the truth. For the American market they should have put a gallons consumed function. Even American cars have that.

I never understood the "I get only 240 miles to the tank" mentality. You really drove from full to E and consumed 16.5 gal?
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      09-18-2013, 11:53 AM   #16
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Wow, you're saying his mpg calculation is based on how many miles he's driven, how many gallons fit in a tank, and doing the division?

That's nuts. BMW assumes that Americans can do math, and it couldn't be further from the truth. For the American market they should have put a gallons consumed function. Even American cars have that.

I never understood the "I get only 240 miles to the tank" mentality. You really drove from full to E and consumed 16.5 gal?
It does track what is in the tank along with injector puls time and all that stuff. I just had both sending units replaced in my x5 for the second time for this. If the OP was really getting 12mpg, thew car would be running so rich that car would be fouling plugs and turning on the CEL. The car would also start to have o2 codes since the readings would be out of spec and then the car would not be able to compensate for correcting the AF ratio and limp the car to keep the cats from over heating. Or the OP is really driving the shit out of it.
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      09-18-2013, 12:09 PM   #17
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Wow that sucks, I have a 335i and I drive it HARD all the time and I still average 18 mpg city
I know right, I have an FBO 335i x drive and WOT every chance I get and still get 18.2

Something's fucky here, I'd bring it into the dealer.
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      09-18-2013, 12:12 PM   #18
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It does track what is in the tank along with injector puls time and all that stuff. I just had both sending units replaced in my x5 for the second time for this. If the OP was really getting 12mpg, thew car would be running so rich that car would be fouling plugs and turning on the CEL. The car would also start to have o2 codes since the readings would be out of spec and then the car would not be able to compensate for correcting the AF ratio and limp the car to keep the cats from over heating. Or the OP is really driving the shit out of it.
Yeah but what I mean is you can't eyeball a fuel gauge, no matter how many markings there are breaking say 1/4 tank into 64ths. My point is if the OP is not using the mpg computer, all bets are off. Simply saying I should get 240 and I only got 218 doesn't mean much.

The better way is to fill up by letting the pump stop on its own. Driving 200+ miles, coming back to that same pump, and let it stop on its own. In theory. Many times with the BMW, the pump stops immediately, so that method is also out.

Now you can't do math, you can't use a pump, really, I think all you've got left is your mpg computer or your butler to do the math for you.
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      09-18-2013, 12:15 PM   #19
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Yeah but what I mean is you can't eyeball a fuel gauge, no matter how many markings there are breaking say 1/4 tank into 64ths. My point is if the OP is not using the mpg computer, all bets are off. Simply saying I should get 240 and I only got 218 doesn't mean much.

The better way is to fill up by letting the pump stop on its own. Driving 200+ miles, coming back to that same pump, and let it stop on its own. In theory. Many times with the BMW, the pump stops immediately, so that method is also out.

Now you can't do math, you can't use a pump, really, I think all you've got left is your mpg computer or your butler to do the math for you.
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      09-18-2013, 12:17 PM   #20
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Wait, are you saying you have a butler?
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      09-18-2013, 02:12 PM   #21
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Wait, are you saying you have a butler?
If I win the powerball tonight!
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      09-18-2013, 02:28 PM   #22
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I am using the mpg computer and its a little over 13 now after cleaning the maf but I feel as though I'm using more gas.
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