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Buick LaCrosse: Real World MPG

richard70richard70 Posts: 2
I have a new 2006 La Crosse with 2500 miles. The gas mileage is awful. 24 and 1/2 miles per gallon on a freeway and 14 miles per gallon in city driving - no traffic jams. My previous car was a 1997 Olds 88. It got 29 miles per gallon on the freeway - often more. The Lacrosse seems to run well. However, the tachometer goes up to 3,000 RPMs in city driving with a light touch on the gas pedal and then drops back down to 1,000 RPM s. Is this normal?
With the very low gas mileage,it seems to me that something must be wrong. Any suggestions on what I should as a dealer's service department to check out.
Thank you.
Richard70
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Comments

  • hjw1hjw1 Posts: 17
    Which engine do you have? If your Lacrosse has the 3800, then something must be wrong that your dealer's service department should be able to identify, and repair. If you have the 3.6, I am not surprised by your mileage results.
  • richard70richard70 Posts: 2
    Thanks to hjw1 for his comment. My Lacrosse is a CS with the 3800 Series III V6 rated at 29 MPG highway. I will make an appointment with the dealer to have the car checked out. 24 1/2 on the highway and 14 MPG in the city does not seem right.
    Richard70
  • sscott3sscott3 Posts: 6
    How does it feel to get screwed by GM? My 05 LaCrosse CXS gets 19.4 mpg with 75% highway driving. I just had it into the dealer today with 12000 miles for an oil change and for poor mileage. They don't have a clue what is wrong. From your description we may have a similar problem. I noticed that this car does not coast nearly as far as my old 99 Regal with the SC3800. This car coasts about 1/4 mile less distance from 70 mph to 45. Too much rolling resistance might cause the RPM to jump up to overcome. My car slows down coasting downhill in neutral. The dealer says the brakes show no sign of heat. The car tracks and stops straight. I don't know what could be causing the mileage problem. I have owned eight new GM cars in my sixty years, but if this is not resolved this one will be my last! I'll buy a Honda or Toyota like everyone else. Please let the rest of us know if you discover the problem.
  • poncho167poncho167 Posts: 1,178
    I wouldn't be happy with that mileage either, but I wouldn't consider yourself screwed. This situation has happened on many over-rated Japanese cars and you shouldn't jump on the Japanese band wagon every time something is not right.
  • bluecxsbluecxs Posts: 5
    I have a 2005 3.6 that gets less than 14 mpg. Buick states that is running to specification. What do you know about the 3.6that makes you think the mileage will not be good?

    Thanks,
  • gorphilgorphil Posts: 27
    The poor fuel economy may be due to an incorrectly adjusted parking brake pedal. In other words, the parking brakes are slightly engaged even when they are supposed to be off.

    This condition can be easily identified if the parking brake pedal has a very short travel when applied.

    My 2005 Allure had this problem.
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,690
    When you reset the mileage meter while you're traveling on an open highway like and interstate at 60 mph, what does the meter say after a few miles of driving at one speed. Is it close to 30 mpg?

    This message has been approved.

  • bluecxsbluecxs Posts: 5
    My highway mileage is about 25. The problem is city driving. My wife used the car for local driving and get less tham 14 mpg. She got almost 17 with my 97 Regal GS.
    The Regal was rated at 18 city and the Lacrosse is rated at 19. I thought I would get close to what the Regal got.
  • jmw4jmw4 Posts: 67
    I have the CXS and routinely get 21 mpg in a mix of 80% highway. Straight highway is about 25/26, but a lot of stop and go traffic can easily keep city mileage at 15 - 16 mpg. The car has been perfect mechanically, but the mileage is rather poor.
  • hjw1hjw1 Posts: 17
    The 3800 models come with a 2.86 axle ratio, the 3.6 models come with a 3.69 axle ratio. The difference makes sense because the 3.6 develops its increased horsepower at a fairly high RPM. The result is that the 3.6 will have better performance, but at the expense of fuel economy.

    My experience is with the Series II 3800. I would like to hear more feedback from Series III owners, regarding their fuel ecomomy.
  • 62vetteefp62vetteefp Posts: 6,048
    REally should not be any difference due to Series III. I think the only real difference is the structural oil pan.
  • hjw1hjw1 Posts: 17
    My wife and I are considering buying a LaCrosse or Lucerne next spring. I would like one last 3800 because of the engine's reliability and efficiency. I'm counting on the Series III being everything the Series II was, or better, but I'm very interested in what owners are experiencing.
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,690
    Does the III have an aluminum intake?

    This message has been approved.

  • hjw1hjw1 Posts: 17
    Yes, I believe it does.
  • evandroevandro Posts: 1,108
    Aluminum intake manifold, electronic throttle, complies with current emission standards, etc.

    HTH
  • 62vetteefp62vetteefp Posts: 6,048
    Oh yea, the drive by wire throttle does improve vibration feel to the driver. Still I do ont believe that will have much effect on reliability vs the old series II.
  • evandroevandro Posts: 1,108
    Actually, as it's a new feature, it's likely to be a minus in reliability terms.

    Too bad, for this is the last incarnation of the venerable 3.8 V6.
  • 62vetteefp62vetteefp Posts: 6,048
    Actually it is new on the LaCrosse but has been used before. I see the LaCrosse in the top 3 for quality when the June IQS2 comes out. Last year it was beat by the Century/Impala/Grand Prix. With the Century gone it should move up.

    Yea, the LaCrosse will be the last to use the 3800. Time for it to fade into history.
  • bluecxsbluecxs Posts: 5
    I suggest, before buying a LaCrosse, test drive a used LaCrosse or get a rental for a few days.
    My interior is very noisy, the drive train is noisy, I have severe wind noise when there is a cross wind and almost all interior panels squeak. My console squeaks when I hit the brakes or gas. The door panels squeak when I turn during the first drive of the day.
    Buick can't fix anything because they cannot hear anything.
  • 62vetteefp62vetteefp Posts: 6,048
    Test drive is a good idea. My moms CX is the quietest car she has ever driven. Rides like a dream. That is her take on it.
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