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Buick Lucerne: Real World MPG

Karen_SKaren_S Posts: 5,094
How's your Lucerne MPG?

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  • I have a new 2006 Lucerne CXL V8 with about 750 miles on it. I've checked my city mileage twice and both times it was around 14.2 MPG. Haven't had a chance to check it on the highway mileage.
  • My Lucerne CX is just a week old with 532 miles on it.

    One highway test,(210 miles round trip)used just

    7.25 Gal or about 29 MPG,for this full size car!

    I will update again as I have

    longer trips planned. The best compliment I can give is

    that the Buick Lucerne is exceeding my expectations.
  • Last weekend we took a trip and on the way home got as high as 33mpg cruising at 60mph. Overall for 450 miles we averaged around 31mpg. Not bad for a full size car!
  • We are visiting the gas station LESS often!

    Our new Lucerne CX definitely uses Less gas than our old
    1994 Park Ave that had 30 HP. less power !

    For a full-size car the highway mileage of 29-30 MPG.
    and city mileage of 20, (or more) exceeds expectations,
    while providing a really quiet and comfortable ride.
  • 76ta76ta Posts: 3
    My CXS @70 MPH comes in at 26MPG. I am using 89 octane fuel and would be interested in seeing results using 87 & 93 octane. City mpg varies on who drives the car, between 15 and 18 MPG.
  • Just got back from vacation. Today we averaged 67.6mph for 245 miles (all interstate) and the DIC said we averaged 32.3 mpg. Could NOT be happier with the mileage so far!
  • I'm especially curious about those of you that own the Northstar V-8 model.
  • My 3.8 L CX consistently gets 30 -31 mpg at a cruise-controlled 75-80 mph. I know of no other non-diesel large car that gets this kind of mileage. And the V6 is not in the least underpowered. Smooth and quiet too.
  • I agree 100%, I get the same kind of mileage with my CX. Over 500 miles on a tankful in a comfortable full size car is hard to beat.
  • My 2007 CXL with the 3.8 engine shows 22mpg on the drivers information center, but when I do the math by hand I come up with 25mpg. This is with a mix of highway and DC beltway gridlock driving.
  • dodgeman07dodgeman07 Posts: 574
    I'm getting close to this figure in my '06 Lucerne CX with the 3.8L V-6. A recent trip got me 30 mpg at 65 mph on the open road with an average of 27 mpg overall (80% highway driving). I'm very happy with that in a full-size sedan.
  • tf712tf712 Posts: 7
    I've been manually keeping track of my mpg since January this year. I commute everday from the outlaying 'burbs of Chicago to downtown (100 miles round trip). With all the construction and traffic backups I'm averaging 22-23 mpg. During the last winter when construction ended I was averaging 24. Haven't taken a real all highway trip yet but I'm curious to see what kind of mileage I'll get.
  • I think you'll be pleasantly surprised.
  • kcwolfpack59kcwolfpack59 Posts: 122
    My CXL V6 gets about 25 on the interstate. I had a 2000 Lesabre Limited with the same drive train. It got 30-31 on the same route driven the same way.
    The car now has 1000 miles and the tire pressure is set right from the beginning. I don't think the engine will loosen up significantly. I know it is a couple of hundred pounds heavier than the old car but is more streamlined to make up for it. I think there is something wrong. I will try again before taking it back to the dealer.
    Phone call to dealer resulted in nothing. They said that since the check engine light did not come on, there should not be a problem, and there were no TSBs, but I can bring the car in.
    Other than that, I am the happiest I have ever been with any new car.
    Any V6 drivers go back to the dealer and get any resolution for better gas mileage?
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 21,316
    Are you resetting the mileage average readout on the DIC when you begin the trip on the interstate? I like to reset just as I get on and then watch to see what it's doing.

    What kind off interstate? Hilly? Level?

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • Going a steady 60-70 on the interstate I get 31-33 mpg so I have no reason to go back to the dealer. (2006 CX)
  • kcwolfpack59kcwolfpack59 Posts: 122
    Yes, I do reset the DIC as I gas up,{same gas station} about a mile before the interstate. The trip is through Missouri and Arkansas so there are hills. Round trip is 320 miles and it was not windy. I drive conservatively and steadily about 70, the same way I drove the Lesabre.
    The Lucerne has the Energy MX4 Plus Michelin, which I assume are known for low rolling resistance.
  • fdunbarfdunbar Posts: 4
    I have a 2007 Lucerne (6 cylinder) with 3800 miles on it. On a recent trip from Florida to Maine I averaged 25.9 mpg. This is pretty poor since I averaged over 30 mpg on my 2003 Buick LeSabre. Overall, in the last 2500 miles, including the trip from Florida to Maine, with more highway driving, I am averaging 24 mpg. Since most is highway driving, I think thew mileage is quite poor. Bet it averages well below 19 in the city.
  • fdunbarfdunbar Posts: 4
    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.
  • rhbaldrhbald Posts: 1
    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.
  • We get 30+ mpg but that's only on the interstate. Around town we average 20-25. '06 CX, V-6.
  • taraleetaralee Posts: 13
    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." :confuse:
  • 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.
  • 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.
  • taraleetaralee Posts: 13
    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.
  • taraleetaralee Posts: 13
    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.
  • 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.
  • grisbygrisby Posts: 2
    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.
  • I found with my CXS (V8) that I can achieve 30 - 31 MPG, but there is one catch. I can only obtain this on Highway traveling at 53 MPH! At 55 MPH 29 - 30 MPG.

    I would say the Bucik Engineers did not consider gas economy when considering gear ratios. A 6 speed transmission is a must with 100 dollar a barrel oil prices.
  • I see the government has posted its new mpg ratings for the 6 cylinder Lucerne as 16 mpg city - 26 mpg highway and combined 20 mpg. Sounds more like what many of us are getting. I do not understand how people are claiming to get over 30 mpg highway and 25 or 26 combined are getting it. I wish I had their luck.
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