Last post on Sep 11, 2013 at 4:08 PM
You are in the Buick Lucerne
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Buick Lucerne, Fuel Efficiency (MPG), Sedan
#20 of 106 Re: Buick Lucerne: Real World MPG [fdunbar]
Aug 14, 2007 (11:47 am)
Update on mileage.
I now have 5200 miles on my 2007 Lucerne CXL (6 cylinders). I have reset the mpg indicator for my last 1400 miles of driving. My driving is in a small seaside resort with sometimes heavy traffic and country driving along with some interstate. My overall mileage is now 20.3 mpg. My dealer says that is normal for this car. I am amazed at the mileage some people say they are getting, especially since I never gun the engine.
#21 of 106 Re: Buick Lucerne: Real World MPG [KarenS]
Aug 14, 2007 (3:45 pm)
I'm sorry to say that my 2007 Lucerne CXL (approx 6600 miles) does not get the MPG as posted. I drive in the city for the most part and I'm lucky if I can get more than 17 MPG. My '94 Park Ave and '85 Park Ave, both gave me at least 19 MPG. So I am so disappointed, especially now that gas is so expensive, and I'm careful on the gas petal.
#22 of 106 Re: Buick Lucerne: Real World MPG [fdunbar]
Aug 16, 2007 (3:12 pm)
We get 30+ mpg but that's only on the interstate. Around town we average 20-25. '06 CX, V-6.
#23 of 106 Re: not real happy [kcwolfpack59]
Oct 10, 2007 (7:27 am)
My husband and I love the car, the ride, and all the "Cadillac" amenities that came with it....BUT, From the time I brought my Lucerne CXL 3.8 6 cyl home, I've dealt with bad gas mileage ranging from 16mpg to 22mpg even on the highway. A mechanic friend of mine suggested that I change my existing oil from the factory oil to "full synthetic" oil to see if that would help. It did help, it went up to 29-32 mpg immediately! It rocked on for 6 months doing great, now it has fallen back to 22mpg or less. I have addressed it with the dealership from the git go. I have heard everything from, "it's bad gas" to "every vehicle has a break in period, give it some time." Well I have 15,800 miles on it and still getting bad mileage....I took it in to the dealership last week and they did a computer diagnostic and found no codes whatsoever! They didn't even bother trying other solutions like changing the fuel filter, or checking for a crimped fuel line, they sent it home telling me "if it gets any worse, bring it back."
#24 of 106 Re: not real happy [taralee]
Oct 10, 2007 (6:12 pm)
With 6500 miles, the gas mileage has improved only about 1 MPG since new. I think I will wait until it gets about 8000 on it to start complaining to the dealer more so I don't get the "break in" answer.
Taralee: which brand and weight of oil did you use to get the mileage to jump? Thanks.
#25 of 106 Re: not real happy [taralee]
Oct 12, 2007 (3:23 pm)
My wife and I just finished a road trip (1360 miles) around the state (WI) and the DIC said we averaged 30.8 mpg ... doing it long hand (miles traveled divided by gallons of gas purchased) was within a couple tenths of a mpg. I use the basic 5W-30 oil the dealerdship puts in at oil changes. I do put in a bottle of injector cleaner after each oil change, not sure if that helps but I figure it can't hurt.
#26 of 106 Re: not real happy [waynenovotny]
Oct 14, 2007 (5:48 am)
Yes, I calculate my mileage the same way. I was advised not to add injector cleaner until the car gets over 35,000 miles on it. We have done some checking with various mechanics and it is their opinion that our problem may lie with the computer chip that regulates the injectors and the timing. There are so many happy Lucerne owners here with great gas mileage that I am almost certain that mine just has a bad chip or a lemon off the assembly line. I will contact Buick this week and post their reply to this problem.
#27 of 106 Re: not real happy [kcwolfpack59]
Oct 14, 2007 (5:58 am)
Castrol Syntec 5W-30 full synthetic. It's expensive but it sure was worth the change for a little while I told the mechanics at the dealership what I did, and they had no problem with me changing the brand of oil as long as the oil is the approved weight and specifications dictated in the manual.
#28 of 106 CXS and Northstar 4.6L MPG
Oct 14, 2007 (10:56 am)
Have averaged 21.1 MPG combined city and highway for the first 6700 miles. Would like to learn of other owners' experiences with this engine.
#29 of 106 Re: CXS and Northstar 4.6L MPG [b88lazer]
Oct 15, 2007 (6:43 am)
I have the CXL with the 4.6 Northstar and combined city and hiway I am getting about 20.8 mpg. I have 5900 miles on it now. I recently took a trip to Fla (I live in PA) and the best tank got me 26.6 mpg with an overall average for the trip of 24mpg.