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BMW 3-Series Real World MPG

135

Comments

  • I have a 328 coupe. Disappointingly it gives me 20 mpg irrespective the TLC with which I drive it. Highway driving vs city driving hardly ever seems to make a difference. I hardly ever drive during the rush hours so most of my driving is on open roads and I still end up with such a low figure. Anybody else with a 328 coupe who is getting similar figures?

    Is this expected or should I take it in for an inspection?
  • kdshapirokdshapiro Posts: 5,751
    That sounds low. I'm assuming you have an automatic. Do you drive in sport mode? Are you measuring the gas mileage by the computer or gallons filled at the gas station? Maybe an ecu flash is needed? Is it fully broken in? Take it into BMW and see what they say.
  • circlewcirclew Posts: 8,253
    I am assuming tire pressure is checked every 3 weeks and premium gasoline is your choice.

    Regards,
    OW
  • Hi. I just purchased a 2000 328ci and the on-board computer is telling me I'm getting 5.9MPG. I know this isn't so just from driving it, but why would it be telling me this? Does it need to be reset? And how accurate are the on-board stats?
  • roadburnerroadburner Posts: 6,019
    I know this isn't so just from driving it, but why would it be telling me this?

    It could have been reset and then just driven around the dealer's lot.

    Does it need to be reset?

    Yes.

    And how accurate are the on-board stats?

    The actual fuel economy is @95% of the average OBC economy.

    2009 328i / 2004 X3 2.5/ 1995 318ti Club Sport/ 1975 2002A/ 2007 Mazdaspeed 3/ 1999 Wrangler/ 1996 Speed Triple Challenge Cup Replica

  • Ok since I posted about 8 months on this site about my gas mileage of 15-16 mpg on my 2007 328i, my mileage improved to 19 mpg! And that is with 90% stop-and-go city LA traffic. I am very happy about it. Actually the mileage suddenly became better after about 6,000 miles.

    My new problem is for the last month, my fuel gauge has been acting crazy. I would fill a tank of gas, and it would show accurate reading, and then, after about half-a-tank is gone, the gauge would just go to Zero or even less than Zero and it would indicate that I am out of gas! I ran to the gas station just to find out that I really have plenty of gas left and it is just a false reading. But it's been doing it lately. What could be the problem?
  • roadburnerroadburner Posts: 6,019
    What could be the problem?

    The E36(1992-1999) 3 Series cars had a similar issue. In that case the problem was caused by corrosion deposits on the fuel sending unit contacts within the gas tank. BMW cured the problem by introducing a replacement unit fitted with gold contacts that do not corrode. I solved the problem on my 1995 and 1998 3ers by using only Top Tier gasolines- which contain detergent properties that prevent the deposits from occuring. That said, since your car is still under warranty I'd simply return it to the dealer. If you want to attempt an interim fix, you could try adding a bottle of Techron to your fuel; it can't hurt and it may fix the problem temporarily.

    2009 328i / 2004 X3 2.5/ 1995 318ti Club Sport/ 1975 2002A/ 2007 Mazdaspeed 3/ 1999 Wrangler/ 1996 Speed Triple Challenge Cup Replica

  • davidd3davidd3 Posts: 582
    2006 330i, non-sport.

    Put on nearly 11,000 miles in 2007 and averaged 24.34mpg in a mixture of roughly 2/3 highway 1/3 city driving. Best tank (mostly highway) returned 27.31mpg. Worst tank (mostly city) returned 21.17mpg. Use sports mode frequently in city driving.

    No question in my mind this car would get low 30s on a highway trip, and not just in the right lane at 55mph. I've seen what it's capable of on highway drives of 30 to 60 miles, at 70-80mph. I always have my on-board computer set to display the mpg.

    Quite pleased getting this kind of gas mileage from a sports sedan. The G35 I had before it averaged about 22mpg.
  • davidd3davidd3 Posts: 582
    Oh yeah, I should have mentioned that my car has an automatic transmission.
  • Thank you roadburner, I have been using only the premium gas and I told the dealer about the problem, and it appears from the comments they did some diagnostics on it.
  • That is a great mileage. Mine on my 328i is steady 19.1-19.3 mph 80% City/20% stop-and-go freeway. I do use sports mode sometimes. I have 11,000 miles on it. I assume it will improve a little as I drive another 5-10,000 miles and I will be very happy.

    I assume with new EPA testing rules come around 2009, we are going to see more realistic figures. Hopefully, they will take cars off treadmills to an outside environment this time
  • idoc2idoc2 Posts: 78
    I drive a 2007 328xi. 60% hiway 40% hilly country roads in CT with a few stop lights. I average consistently 22MPG on 93 octane. This has been true from my third tank of gas. In cold weather I may get 1 or 2MPG worse. I am not lead footed. On the hiway over 100+ miles without stops I can get as much as 27MPG at 70-75MPH (by BMW speedo which we all know reads 4-5MPH fast at this speed). This seems to be consistent with others.

    Idoc
  • shiposhipo Posts: 9,152
    "I assume with new EPA testing rules come around 2009, we are going to see more realistic figures."

    Correct me if I'm wrong, however, I believe that the new EPA mileage ratings went into effect for the 2008 model year.

    http://www.epa.gov/fueleconomy/

    Best Regards,
    Shipo
  • davidd3davidd3 Posts: 582
    Mine on my 328i is steady 19.1-19.3 mph 80% City/20% stop-and-go freeway.

    Your city/highway mix is heavy on city driving (80%) and even your highway miles (20%) are stop and go. I think 19+mpg is good for your particular circumstances.

    I have 11,000 miles on it. I assume it will improve a little as I drive another 5-10,000 miles and I will be very happy.

    My 2006 330i has 35,000 miles on it. While many people say gas mileage improves after the first x,000 miles, I have never personally experienced it. With my cars, the mpg from the beginning is pretty much the same throughout.
  • I agree. By 3,000--5,000 miles you are locked in.
  • I live in the SF Bay Area and have been averaging 19-20 with stop/go traffic (70%) and highway (30%). I have just over 6700 miles now and for the last 500 or so miles my mileage has jumped up pretty significantly, averaging 23.0 without a change in driving pattern. Nice! I've only been filling it with Shell 91, seems to be a pretty good formulation.

    I was able to fill up one day, get right on the highway, and drive about 45 minutes WITHOUT traffic (I was shocked) doing 75-85mph and averaged 32.3 mpg roundtrip. The engine is clearly fuel efficient if given the right opportunity. Looking forward to a weekend trip to LA in a few weeks to get an even better assessment.

    Just wanted to post my results thus far, will keep you posted after the LA trip (approx 5 hours). Still can't believe I haven't changed the oil yet, I'm starting to lose sleep about waiting another 9k miles to change it!
  • With the BMW 6 cylinder engine, you need to be able to spend time in overdrive gear for the mileage to improve significantly.
  • new0rdernew0rder Posts: 9
    I think the bridge stone RFT with noise got the mileage low, I am getting about 20.2 50-70 mph on highway, day to day work travel 24 miles. I was getting more when the car is new. atleast 23mpg
  • circlewcirclew Posts: 8,253
    Tire pressure is key.

    Regards,
    OW
  • arm51arm51 Posts: 4
    The 328i manual that I drive sporadically usually gets around 22-23 mpg in the city if driven carefully. When I drive with a bit more enthusiasm, it drops to about 17-19 mpg. On the highway, it generally sits around 30; however the best tank so far has been 32mpg.
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