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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: 18,200
    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?
  • 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: 18,200
    Does the III have an aluminum intake?
  • 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.
  • adamcadamc Posts: 5
    I've test driven two and they've been blissfully quiet.
  • bluecxsbluecxs Posts: 5
    My LaCrosse was quite for about 6000 miles, then it started to get extremely noisy. That is why I said to test drive a used car or a rental.
  • 62vetteefp62vetteefp Posts: 6,048
    You said Buick cannot hear anything. Are you talking about a dealership? If so have you tried going to a different one. Dealerships are independent and you can take it to any one you want under warranty.
  • jmw4jmw4 Posts: 67
    I think I know what you are referring to by the creaking console. It's all plastic and in cold weather over rough road I can hear it also in my CXS. Now that the weather is warm, it is fine. Everything else is as tight and rattle free after 14,000 miles as the day I bought it. Aside from that occasional console creak, I find it one of the quietest cars I have ever driven, little if any road and engine noise. Quieter than my past lexus or acura cars I have had.
  • kevokevo Posts: 6
    I posted to this forum (I think) way back around Feb 05 saying how pleased I was with my CXS. I would like to take it all back now. I would like to chime in on the poor fuel mileage and squeaks and rattles. The car has never gotten better than 17 mpg 50/50 highway/city. The car has 12,500 miles and I have squeaks all of the time, hot or cold. Too bad the rest of the car is quiet because it makes the squeaks all the more noticeable. I'm going to take it in the shorts when I trade this heap on a foreign car. As a comparison, my mother bought a Lexus ES330 one month before I bought mine. She now has 40,000 and the car is as nice today as the day she got it and even gets good mileage.

    I had to edit the post because I forgot to write about the paint chipping. It seems to be really soft paint or something due to the chips where one doesn't expect to have chipped paint, rear bumper, rear decklid, high on the hood near the windshield.

    SHAME ON GM.

    As an aside, the service received from the dealer I bought it has been marginal at best. I just love dirty motor oil on my nice leather seats and waiting an hour for said oil to be changed. Twice.

    Kevin
  • jmw4jmw4 Posts: 67
    Too bad on the squeaks and rattles. Since the weather turned warm, even the console creak is gone on mine and I never did have any rattles. I had a lexus es300 once and it squeaked from the day I bought it till I got tired of it mostly due to the short seat bottoms. Only negative I have on the Lacrosse is the gas mileage in stop and go traffic. On the highway, I can get up to 27 mpg. You are correct on trade value, at present, one would be lucky to get about $19,000 on a trade for average miles, assuming one optimized the cost of their new car purchased.
  • gorphilgorphil Posts: 27
    If owners are using the economy indicator in the Driver Information Centre to determine mileage, reset it and see what happens. The economy indicator in my 2005 Allure was stuck on 11.4 liters per hundred kilometers and did not change. After I reset the indicator, it operated properly. It now shows 11.1 liters per hundred kilometers for combined driving. Not as good as my 2002 Regal.
    I also have the creak in the console; however, I have not investigated to determine the cause. The left side appears to be up too high at the back. Perhaps there is an adjustment.
    No problems with water leaks and the car is very smooth and quiet.
  • kevokevo Posts: 6
    I use the economy indicator as a snapshot and reset it at each fill-up. I back that up with the good ol' math Miles/Gallon. They are always close, usually the car is more optimistic than reality. 17-18 MPG tops. The instantaneous MPG sometimes goes up around 30, but pull a slight hill and it drops to 13-14. With economy like this, I see no penalty in getting the SUV I wanted in the first place.
  • sscott3sscott3 Posts: 6
    I do consider myself screwed. I have had the car back to the dealer more than once and at first they trued to tell me it was the way I drive, giving me driving 101 type advise. Then they said that because the EPA rating is 19 to 27 and I am getting 19.4 that is normal. My 99 Regal GS with the SC3800 got 22 to 23 mpg. Same driver, same route, same everything except the car. I'm an engineer for a supplier to the auto industry and I have always been pretty avid about buying American. I got over it. GM has lost about half of their market share over the last 30 years, one customer at a time. I've worked with GM, Ford, Chrysler and Toyota developing parts and in my opinion Toyota has their act together. It's not surprising to me that they are continuing to grab more and more market share. To be fair, I like the LaCrosse, but the poor mileage is hard to take. It costs me about $300 per year in extra fuel cost at $3/gal. My current plan is to stencil "19 MPG" on the inside of each back window so others can know what they can expect from a LaCrosse.
  • adamcadamc Posts: 5
    It's just one thing to consider, and I don't want to overstate the significance of it, but with the new ethanol standards for gasoline, everybody is getting slightly worse mileage these days.

    Ethanol is less energy dense than gasoline, and many folks have reported a 5-6% drop in mileage with the new formulation.
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