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LaCrosse Gas Mileage
by richard70
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May 13, 2006 (6:09 pm)
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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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- #3 of 60
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Re: LaCrosse Gas Mileage [richard70]
by hjw1
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May 14, 2006 (12:36 pm)
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Replying to: richard70 (May 13, 2006 6:09 pm)
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.
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- #4 of 60
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Re: LaCrosse Gas Mileage [richard70]
by sscott3
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May 17, 2006 (3:56 pm)
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Replying to: richard70 (May 13, 2006 6:09 pm)
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.
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- #5 of 60
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Re: LaCrosse Gas Mileage [sscott3]
by poncho167
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May 18, 2006 (5:02 am)
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Replying to: sscott3 (May 17, 2006 3:56 pm)
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.
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- #6 of 60
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Re: LaCrosse Gas Mileage [hjw1]
by bluecxs
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May 18, 2006 (4:29 pm)
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Replying to: hjw1 (May 14, 2006 12:36 pm)
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,
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- #7 of 60
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Re: LaCrosse Gas Mileage [sscott3]
by imidazol97
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May 19, 2006 (4:16 am)
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Replying to: sscott3 (May 17, 2006 3:56 pm)
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?
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- #8 of 60
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Re: LaCrosse Gas Mileage [imidazol97]
by bluecxs
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May 19, 2006 (1:34 pm)
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Replying to: imidazol97 (May 19, 2006 4:16 am)
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.
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- #9 of 60
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Re: LaCrosse Gas Mileage [bluecxs]
by jmw4
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May 21, 2006 (5:15 am)
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Replying to: bluecxs (May 19, 2006 1:34 pm)
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.
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- #10 of 60
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Re: LaCrosse Gas Mileage [bluecxs]
by hjw1
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May 21, 2006 (4:30 pm)
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Replying to: bluecxs (May 18, 2006 4:29 pm)
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.
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