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Buick LaCrosse: Real World MPG

103 messages,  Last post on Nov 29, 2012 at 8:35 AM

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

Messages Page 7 of 12

#52 of 103 2007 Lacross by cerimele

Nov 02, 2007 (5:44 pm)


I just purchased my 2007 Buick Lacross I am only getting 12 mpg on the highway I drove 680 miles last week end and used $90.00 worth of gas 3.00 per gallon,I only had the car 3 or
4 weeks at the most I am just sick,I drive 60 miles per week
back and forth to work, on Wenesday I put in 10.00 for a test run I drove 31 miles since then and I have 1/8 of a tank today Friday,there is something that is not right with this gas milage.I like some suggestions please.I need help.

#53 of 103 Re: 2007 Lacross [cerimele] by hitman1970

Nov 04, 2007 (6:34 am)

Replying to: cerimele (Nov 02, 2007 5:44 pm)
What trim vehicle do you have? Did you buy it new or used? How many miles were on it? Either way you should be getting 30 MPG with the 3.8L at 70 MPH on the highway or 27 MPG at 70 MPH with the 3.6L. How fast do you drive? You definately have the right to get this fixed.

#54 of 103 Re: 2007 Lacross [cerimele] by bxd

Jan 23, 2008 (10:19 am)

Replying to: cerimele (Nov 02, 2007 5:44 pm)
680 miles, using $90 of gas, at $3/gallon, means you burnt 30 gallons. 680 / 30 = 22.7 MPG.
 
A little low, but depending on driving style, city vs. highway, engine choice, and how new the car is (MPG increases after engine break-in), temperatures, etc. this isn't outlandish. Where is the 12MPG coming from? I bet that is from the INSTANT MPG display. That is normal, when you step on the gas hard to pass someone, or drive into a headwind, or climb a hill... you should expect that, even single digits. But then going DOWN hill, etc. you will see it go to 40, 50, even 99 MPG.
 
Is your service engine light on?

#55 of 103 LaCrosse MPG by g_allen

Mar 20, 2008 (2:02 pm)

I have been interested in getting a LaCrosse. My mother has one and she and my stepfather went on a summer vacation out West last year and she said they received 28 MPG. They have an '05 CX. Hope this helps.

#56 of 103 LaCrosse Super's MPG by jpstax1

Mar 24, 2008 (10:27 am)

We just got back from a 400 mile (round-trip) to Kalamazoo, Michigan yesterday. Averaged about 27 MPG on the highway. It would have been even higher except for some slow-downs in construction zones. Not too shabby for a 5.3 liter V-8 engine with active fuel management. Around town, we averaged about 17-18 MPG.

#57 of 103 Re: LaCrosse Super's MPG [jpstax1] by bxd

Mar 24, 2008 (10:34 am)

Replying to: jpstax1 (Mar 24, 2008 10:27 am)
When you say you averaged 27mpg, was that based on the average economy figure from the Driver's Information Center? When you weren't in changing traffic, what speed did you have the cruise set to?

#58 of 103 Re: LaCrosse Super's MPG [bxd] by jpstax1

Mar 24, 2008 (10:55 am)

Replying to: bxd (Mar 24, 2008 10:34 am)
Yes. It was based on the average figure from the DIC. BTW, I forgot to mention it was the highest figure attained during the entire trip. Cruise was set to 65, even though the speed limit was 70.

#59 of 103 Re: LaCrosse Super's MPG [jpstax1] by g_allen

Mar 24, 2008 (12:27 pm)

Replying to: jpstax1 (Mar 24, 2008 10:55 am)
Is it true that the DIC is a little optimistic when it comes to reporting MPG? I thought the Impalas SS/Grand Prix GXP/Lacrosse Super all got poor mileage? Several owners are reporting hwy. figures at around 23 mpg. Seems like these engines would do better. I know they rated them at 28 mpg under the old EPA methods which seemed a bit generous, but the new 24 mpg rating seems low....even for a V8 with AFM. I mean, it's still better than a Charger's/300C's EPA rating, but my cousin has a 300C and I have witnessed 26 MPG on the highway which it appears the 5.3 V8 cannot accomplish. Wonder if the Chrysler's do better because of the 5 speed auto. trans.?

#60 of 103 Re: LaCrosse Super's MPG [g_allen] by jpstax1

Mar 25, 2008 (9:49 am)

Replying to: g_allen (Mar 24, 2008 12:27 pm)
[quote] I mean, it's still better than a Charger's/300C's EPA rating, but my cousin has a 300C and I have witnessed 26 MPG on the highway which it appears the 5.3 V8 cannot accomplish.
 
[reply] I already said my LaX Super, with its 5.3 V8, got a maximum of 27 MPG on the highway during a recent long-distance trip.
 
[quote] Wonder if the Chrysler's do better because of the 5 speed auto. trans.?
 
[reply] The 300C's mileage may also depend on its final gear ratio. I think we can assume that all DICs work the same way. I read where the DIC relies on input from the PCM, which monitors the odometer and fuel consumption rates, and uses it for its MPG calculations.

#61 of 103 Re: Update on mileage [jfgte8296] by lacrossesoaked

Mar 29, 2010 (8:39 am)

Replying to: jfgte8296 (Jul 01, 2006 9:44 am)
I've got center vent noise on my '05 LaCrosse. Did you come up with a fix? The noise is like a buzzzzz, vibration....same thing by the vent to the left of the steering wheel.

Messages Page 7 of 12

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