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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > What would be the reason for bad mpg?



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      12-30-2015, 08:24 PM   #1
Black_e90
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What would be the reason for bad mpg?

I had a bad o2 sensor so I figured that's what was giving me bad mpgs. I changed it about 2 months ago and I'm still only getting 20.2 mpg wtf?! I just did a mini road trip and drove for 4 HOURS at 60mph and under 2k. My mpgs went from 20.2 to 20.4. What the hell is wrong? No engine light or anything. Before my sensor issue my car would get up to 22.9 mpg with city driving. I have a 3.0 328i....
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      12-31-2015, 12:43 PM   #2
pmmcbl
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Silly question, but did you reset it? Also what engine are we looking at?
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      01-01-2016, 05:07 AM   #3
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Did you check tire pressure
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      01-03-2016, 08:06 PM   #4
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New driving areas? Speed limits where I live at 15, 25, and 35 mph.

My MPG sucks. I get better MPG driving 120 mpg on the autobahn.
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      01-06-2016, 12:42 AM   #5
Black_e90
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Quote:
Originally Posted by blackturbo View Post
Did you check tire pressure
What's a good psi to leave it at?
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      01-06-2016, 12:42 AM   #6
Black_e90
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Quote:
Originally Posted by svtfast View Post
New driving areas? Speed limits where I live at 15, 25, and 35 mph.

My MPG sucks. I get better MPG driving 120 mpg on the autobahn.
No, same stuff.
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      01-06-2016, 12:43 AM   #7
Black_e90
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Quote:
Originally Posted by pmmcbl View Post
Silly question, but did you reset it? Also what engine are we looking at?
Yeah it was reset. And I have the 3.0 n51b I think?
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