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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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#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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