Last post on Sep 11, 2013 at 4:08 PM
You are in the Buick Lucerne
What is this discussion about?
Buick Lucerne, Fuel Efficiency (MPG), Sedan
#75 of 106 Re: Lucerne MPG sucks [buddiemac]
Jun 25, 2008 (7:09 am)
I'm not partial to "babying" a 6 cylinder car that should get 29-31 mpg regardless. I had a 1991 Ford Thunderbird with a 6 cylinder engine that got 32 mpg consistently, and later on, I had a 1995 Ford Thunderbird with a V-8 engine that got 25-27 mpg driving 70 mph....I don't feel like I should accept the poor mileage that I get from my Buick Lucerne, when I've had better results from my previous vehicles without complaining....P.S. Driving 55 on a highway with 70 mph traffic is dangerous, unless you're 70 yrs old, and don't mind the obscene gestures by other motorists.
Jul 01, 2008 (12:26 pm)
As stated previously, on three trips to Chicago we got 29.5 to 30.5
(average 30 mpg) driving at 72 mph. My wife tends to drive faster (closer to 75).
We do not "baby" the car, but we definitely do not do jackrabbit starts.
We only accelerate fast on ramps and when passing trucks.
Also, we don't live in town. We live a mile from a small town
and 10 miles from weekly shopping. Those trips are mostly 55 mph.
We did NOT buy a big car for the mpg. We bought a big car for
comfort on the freeway. We have that, along with reasonable
economy on shopping trips.
I wonder if our car is significantly better than the Lucernes that
many of you are driving. I think not. I expect it is your driving
habits. Also, I am sure that commuting in heavy traffic is a real
mpg disadvantage. We do none of that.
#77 of 106 Re: mileage [scandiaken]
Jul 01, 2008 (3:55 pm)
I do not perform "jack rabbit" starts with my car. I accelerate fast on ramps and when passing, I don't live in town, I live 40 miles from the nearest town, and I don't have any heavy traffic out here in the boonies. It's highway driving most of the time and not many start and stops. My average mph is anywhere between 65 & 71 always....So, where do you think my milage problem stems from? The driver? I think not. Again, there are Lucernes out there that are coming off the assembly lines with flaws that affect mileage. I know of 3 people personally here that are having mileage problems and they aren't speed demons. They treat their cars with respect, and drive like they should. Buick needs to address this problem but I've already tried that with no resolve....This problem in the Lucerne does not CODE when attached to the computer diagnostic system at the dealership, which leads me to believe it is a defect in a major part somewhere and Buick doesn't want to tear the car apart to find it.
Jul 01, 2008 (4:20 pm)
Check your tire pressures. Use a correct gauge and put them 2-3 pounds above the recommendation on the door post. Buy only good fuel. Put in a tank of top grade Shell or BP or another solid brand. Then put in a tank of Plus grade. Then check your mileage.
But first check the idling. Check the quick starts. Check the heavy throttle. I'll bet I can take your car, make sure it doesn't have fuel with a lot of alcohol in it, run a bottle of Techron fuel system cleaner through it, then leave on a 300 mile trip and get 31-33 mpg driving at 65-70 on the interstate.
If you believe the car is the problem, I'd suggest trading it for a 6 cyl Camry and report back the mileage after a few months.
Jul 03, 2008 (11:08 am)
I reported earlier that highway mileage on a V-6 2007 Lucerne was 4-5 mpg less than the 2000 Lesabre Limited that we traded off for it. We were getting 25-26 in the Lucerne highway average, with easy interstate driving about 70 mph. I inflated the tires to 32-33 lbs., put in some Techron and tried synthetic Castrol as taralee (I think) suggested. Now it is 26-28 mpg, which is nowhere near the 31-32 we were getting in the Lesabre on the same roads. Our 1992 Olds 98 got the same mileage as the Lesabre did. All three cars have the same engine and transmission. I will give up one mpg less because of our Missouri state mandated 10% ethanol requirement that started a few months after we bought the Lucerne. I also realize the Lucerne in 100-150 pounds heavier than the older cars. I agree with taralee. Some V-6 get significantly different mileage than others. Other than that, I am crazy about this car and highly recommend it. A slight fuel milege penalty is worth it.
#80 of 106 Lucerne MPG
Jul 03, 2008 (1:17 pm)
two weeks ago i drove from Queens to Eastern L. I. for work, trip was 64 miles each way, on the way east i turned off traction control, set the speed to 61 mph and got 34.5 mpg. On the way back west same speed 61mph, traction control enabled and got 35.5 mpg. I have a 06 Lucerne with 11,000 miles on it and I have 35psi on each tire
#81 of 106 Re: still not thrilled [kcwolfpack59]
Jul 03, 2008 (6:38 pm)
I'm curious about how you use the DIC to measure your mileage. If you're clicking it and included engine starts and stops on the average that may explain the difference between some Lucernes. E.g., if I start on a trip I click the DIC to reset when I hit the interstate (about 1 mile from cold start at home) and measure. If I include colds starts in the mileage, it lowers it, of course, unless it's a trip hundreds of miles long.
#82 of 106 Lets do a Lucerne Experiment
Jul 06, 2008 (4:52 am)
Some of us here are having mileage problems with our Lucernes and have since the first day we brought them home....Some of us have been getting excellent mileage from the git go. I have been informed that the dealership that I do business with has a few Lucernes out of hundreds that they have sold, that are having mileage problems that they cannot resolve. They have opened service orders on each one with Buick and checked all possible parts like injectors, fuel pump, throttle body, etc....They (the technicians) took trips over 100 miles with the cars and used premium fuels, they couldn't improve the mileage. Buick gave them a list of things to check, but none solved the problem. They had mine for 3 weeks with no resolve. I used to work in service at a dealership and I had a great Idea....
WHAT IF, it was a certain year, or a certain engine, or a certain assembly line that these lemon Lucernes are coming out of that are having these problems? I compared my VIN number with a friend of ours Lucerne at our dealership, it has the same 6 cyl engine, same year model, but different interior package. Mine is the luxury package with Gold Flash white paint, power leather seats and Onstar. Hers is the standard package with standard white paint, fabric seats, with no Onstar. She is getting 28-32 mpg, I am getting anywhere from 19-23.....HUGE DIFFERENCE! We need to have Buick do a random VIN comparison between the Lucernes having these problems, and the ones that are not. If you know someone who owns a Lucerne that is getting great mileage, go to the dealership and have them compare your VIN information to theirs and note the differences. There could be a unmistakable pattern here!
#83 of 106 Re: still not thrilled [imidazol97]
Jul 06, 2008 (7:39 am)
I check the highway mileage same as you do.
#84 of 106 Re: Lets do a Lucerne Experiment [taralee]
Jul 06, 2008 (7:50 am)
Taralee, does your Lucerne have a sight dead spot in the throttle when you barely start to press down on the gas pedal? Mine does. It is just enough that some folks would not notice. I wonder if this has anything to do with the lower mileage. I drove two other V-6 Lucernes at the dealership and they seemed to do the same thing. Dealer says this is drive by wire and is normal. They hooked everything up and said it was OK. I got their song and dance about how mileage will vary etc. I don't want to be the one that has to keep the car in the shop for a week for nothing conclusive. I can tell you that mine was made in May 2007.