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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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#55 of 60 LaCrosse MPG by g_allen Mar 20, 2008 (1:02 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 60 LaCrosse Super's MPG by jpstax1 Mar 24, 2008 (9:27 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. Replies to this message: bxd (Mar 24, 2008 9:34 am) jpstax1 (Mar 24, 2008 9:55 am) g_allen (Mar 24, 2008 11:27 am) and 1 more...
#57 of 60 Re: LaCrosse Super's MPG [jpstax1] by bxd Mar 24, 2008 (9:34 am)
Replying to: jpstax1 (Mar 24, 2008 9:27 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? Replies to this message: jpstax1 (Mar 24, 2008 9:55 am) g_allen (Mar 24, 2008 11:27 am) jpstax1 (Mar 25, 2008 8:49 am)
#58 of 60 Re: LaCrosse Super's MPG [bxd] by jpstax1 Mar 24, 2008 (9:55 am)
Replying to: bxd (Mar 24, 2008 9:34 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. Replies to this message: g_allen (Mar 24, 2008 11:27 am) jpstax1 (Mar 25, 2008 8:49 am)
#59 of 60 Re: LaCrosse Super's MPG [jpstax1] by g_allen Mar 24, 2008 (11:27 am)
Replying to: jpstax1 (Mar 24, 2008 9:55 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.? Replies to this message: jpstax1 (Mar 25, 2008 8:49 am)
#60 of 60 Re: LaCrosse Super's MPG [g_allen] by jpstax1 Mar 25, 2008 (8:49 am)
Replying to: g_allen (Mar 24, 2008 11:27 am) [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.

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