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Buick LaCrosse: Real World MPG

60 messages,  Last post on Mar 25, 2008 at 8:49 AM

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What is this discussion about? Buick LaCrosse, Fuel Efficiency (MPG), Sedan

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#31 of 60 RE: LaCrosse Gas Mileage by gorphil Jun 04, 2006 (4:58 pm)
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. Replies to this message: kevo (Jun 05, 2006 11:22 am)
#32 of 60 RE: LaCrosse Gas Mileage [gorphil] by kevo Jun 05, 2006 (11:22 am)
Replying to: gorphil (Jun 04, 2006 4:58 pm) 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.
#33 of 60 Mileage point by adamc Jun 06, 2006 (8:56 am)
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.
#34 of 60 Update on mileage by sscott3 Jun 19, 2006 (3:59 pm)
When I bought my CXS in May 05 I was disappointed with the mileage at about 19 mpg. The car continued at just under 20 mpg for the summer and dropped to 19.4 mpg over the winter. I had the same squeaks and rattles others have mentioned particularly in the winter with cold temps. I still have a creek in the dash. I recently took a 500 mile trip over a weekend. Mostly 70 mph (50%) and 60 mph (30%) with some 65 and slower speeds all highway with cruise engaged. It got 24.9 mpg. I suppose that a sustained 55 mph could yield close to the 27 mpg EPA estimate. Others have reported very poor city mileage of around 14 mpg and my 25% city driving on my day to day commute to work is probably what is doing me in. Since reseting the average calculator it's running at just over 20. I now am thinking that it is the axle ratio used for the CXS that is responsible for the poor mileage. The 3800 engine with the higher axle ratio does much better. I traded a car I liked (99 Regal GSE) that got 22- 23 mpg and required premium fuel with an EPA est of 18/26 for an 05 CXS with an EPA est of 19/27 and only needing regular fuel. I gave up the performance of the SC3800 engine expecting better fuel economy. I got poorer performance as expected and poorer gas mileage as well. GM, you wont get another chance at my business. Replies to this message: 62vetteefp (Jun 19, 2006 4:25 pm) jfgte8296 (Jul 01, 2006 8:44 am) russellm (Nov 27, 2006 4:44 pm)
#35 of 60 Re: Update on mileage [sscott3] by 62vetteefp Jun 19, 2006 (4:25 pm)
Replying to: sscott3 (Jun 19, 2006 3:59 pm) The axle ratio has been changed for 2007 for the 3.8 version.
#36 of 60 Re: Update on mileage [sscott3] by jfgte8296 Jul 01, 2006 (8:44 am)
Replying to: sscott3 (Jun 19, 2006 3:59 pm) I fugured out where that creaking in the center console is comming from but not how to fix it yet. If you tilt the two center air vent down all the way, and push down on that plastic base you will here the noise. Now If only I could figure out how to stop it. I may use some dense foam tape to try to dampent it but have to leave room to allow the vents to be tilted. Replies to this message: russellm (Nov 27, 2006 4:44 pm)
#37 of 60 Looking to purchase a 2007 CXL 3.8 LaCrosse by djm2 Nov 16, 2006 (3:47 am)
I am looking to purchase a new vehicle. One of the vehicles of interest is a 2007 Buick LaCrosse with a 3.8 V6 engine, CXL / Drivers confidence pkg., CF5 - Power Glass Sunroof, and KA1 - Heated Front Seats. The vehicle is rated for 20 mpg city and 30 hwy. After reading these postings dealing with vehicle mileage, I am having second thoughts???????????!!!!!!!!!!!!! --- Best regards. --- Dwyane Replies to this message: imidazol97 (Nov 16, 2006 5:11 am)
#38 of 60 Re: Looking to purchase a 2007 CXL 3.8 LaCrosse [djm2] by imidazol97 Nov 16, 2006 (5:11 am)
Replying to: djm2 (Nov 16, 2006 3:47 am) Dwayne,   Having had 3 3800s in heavier leSabres and getting 35-38 at steady cruise speeds below 65 on them and getting 30-31 overall on distance interstate travel with AC on and 3 adults and luggage in the car, I don't understand the lower results for the 3800.   I'd suggest renting one for a trip and even renting one for a few days around town. Get one with a digital readout for mileage that you can reset and watch for a while.   Our leSabres tend toward 24 for me and 22 for my wife in around suburbs driving including short trips to grocery, post office, shopping, etc., ranging 1 to 8 miles.
#39 of 60 Re: Update on mileage [jfgte8296] by russellm Nov 27, 2006 (4:44 pm)
Replying to: jfgte8296 (Jul 01, 2006 8:44 am) I bought my 2006 LaCrosse with the 3.8L engine in July of 2006 and was somewhat up set with the gas mileage, but as the car has broken in the mileage has improved. With 4500 miles on it now, in mixed driving, it's getting between 26 and 28 consistantly. This is a vast improvement from the 18 to 19 I first got it.   I had a 2002 Regal with the same motor and what I'm getting now with the LaCrosse is about what I got with the Regal. I took the Regal on a trip and got 33 mpg with it, but I haven't gone on any trips with the LaCrosse yet.   The only difference I see between the two cars, is the Regal seemed a bit more responsive when given the gas, and no it wasn't super-charged. The Lacrosse seems to downshift more often than the Regal did and the gas pedal seems to be harder to press.   I was told years ago by an old mechanic that you shouldn't see your best gas mileage or performance until an engine has 7000 miles on it. Maybe that's true, at least my cars gas mileage has been going up as the miles have.   It's pretty difficult here in MD to get a good grasp on your gas mileage, since depending where you live determines what additives they put in your gas. If you live where they do smog testing, the gas has an additive to cut down on smog and makes your gas mileage drop, then in the winter they mess with the formulation again. The biggest pain is in your wallet. I can go 20 miles away to the next county and pay 10 to 15 cents less and not have any of these power robbing additives, while getting much better gas mileage. I did that today and in mostly highway driving with some town and a few stop lights, when I got home,I had averaged 30.6 mpg on my average fuel mileage reading, which is usually 1 mpg more than what it is if you figure it out by hand.
#40 of 60 Update 2006 CXS by hitman1970 Nov 27, 2006 (6:10 pm)
My vehicle now has 3300 miles on it. The overall mileage has crept up to 20 MPG. It would be great to see it improve as I head to 7000 miles. Still love this great car.

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