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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 01-08-2005, 11:44 PM   #1 (permalink)
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what could be causing me to get poor gas mileage, i get about 25 mpg at the most on the highway, i have already replaced the fuel filter
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Old 01-09-2005, 12:51 AM   #2 (permalink)
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oh please... 25 mpg on highway??? im luckey to get 20.... deal, u have a 6 cyl!!!
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Old 01-09-2005, 03:31 AM   #3 (permalink)
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I get about 27 mpg when I drive across Oklahoma at 85 mph. I get 30-31 mpg at 70 mph. And this is on a 2.5L with 198k miles.

As for your problem, you might have a failing O2 sensor. My fuel economy dropped my 4 mpg when my O2 sensor started failing.

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Old 01-09-2005, 08:13 AM   #4 (permalink)
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318s rule...I get close to 30 mpg....
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Old 01-09-2005, 02:02 PM   #5 (permalink)
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i got a 94 325is with 73k miles, to my knowledge the o2 sensor has not been changed, i bought the car two years ago with 40k miles
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Old 01-09-2005, 02:20 PM   #6 (permalink)
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I get 26mpg on interstate with the I6, K&N filter, and exhaust system
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Old 01-09-2005, 02:58 PM   #7 (permalink)
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if you are really driving fastup hills and stuff, 25 is ok, i get 25-30 with a heavy foot.
slow down if you are that worried. but if ur only doing a soft 60mph, then get a tune up.
spark plugs
wires
air filter
injector cleaner
use good gas
check exhaust for leaks
clean the throttle body

in short....DO ALL the routine check-ups and small stuff.

Mark
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