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Sedans Pontiac G8 2008 Pontiac G8
1265 messages, Last post on Jul 21, 2009 at 10:14 AM
You are in the Pontiac G8 Forum. Your Hosts are pat & karens
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Replying to: captain2 (Jan 22, 2008 11:29 am) |
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One can certainly choose to compare anything to anything, I suppose. Regarding my reading of the EPA MPG, comparing the G8 GT w/6.0L V8 to a G35 w/3.5L V6 seems somewhat unfair, to me, given the existence of the M45. Much closer in weight & in HP & in performance. ( And fuel economy I see as one aspect of ‘performance’. ) And yet, the G35 is rated at exactly the same EPA highway MPG as the G8 GT V8. 24 MPG. And the M45 is rated at 16 \ 21. That 21 number ( and associated high RPM at highway speeds ) is one primary reason that I did not choose an M45 last time I was shopping for a Sports Sedan. Though ( again ) the M certainly has much to recommend it. And I see the highway number as much more important. Stop + go, lower speed driving, with lots of ( opportunities for ) acceleration tends to be an area where the nut that holds the wheel has much more occasion to [ dramatically ] impact actual MPG. Many ( including some here ) have suggested that anyone looking at a 4,000# sedan with a 6.0L V8 cannot possibly be ( should not be ) concerned with MPG. I do happen to care. In addition to a desire for what I consider a reasonable trade-off between acceleration performance, carrying capacity & efficiency, I also look at driving range. To me, a difference of 21 to 24 ( 3 MPG = over 14% better ) in highway MPG is also the difference of over 50 miles in range, on 18 gallons of gas. ( To be fair here, the M45 does have a 20 gallon tank vs. 19 for the G8 – so if you run both leaving approx. 1 gallon ‘in reserve’, the G8 will only be able to travel an additional 33 miles. But the M45 will then require an additional 2 or 3 cups of hot & tasty coffee worth of gas when filled. Each time it is filled, under these conditions. ) - Ray Looking forward to fuel use reports from actual customers in actual driving . . . Maybe next month? |
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| G8 will be in next issue of C&D. | |
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Replying to: mr215 (Jan 24, 2008 11:10 am) -mike Motorsports and Modifications Host
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Replying to: mr215 (Jan 24, 2008 11:10 am) |
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Replying to: paisan (Jan 22, 2008 4:13 pm) Don't believe so- or at least not if Hyundai is thinking the car is a Euro 'sports sedan' competitor. Of course Hyundai is the one that has the chutzpah to compare the Sonata to a 3 series. Since this is a G8 forum though - think it will be a big mistake if GM 'tunes' the car like a skateboard. It is a large heavy sedan and should play to those that need a big 'family' sedan but also has some fond memories of the 'muscle car' past. An older demographic (like me) for sure but also one that historically has shown to prefer the softer highway cruisers - one of the reasons why cos. like Toyota/Lexus sell so well in this country. If the G8 is that stiffly sprung 'skateboard' it will lose any chance it might have to appeal to the masses and will relegate itself more into the category of a low volume curiosity or 'speciality' car. Back on the subject of REAL gas mileage - the 300Cs ratings are one of the biggest jokes in the industry simply because DOD ,which is obviously designed to maximize things on a simple constant (and relatively low ) highway speeds still does not reflect the way we actually drive. It has nothing to do with what the G8 might do in a laboratory, but more to do with what happens when you actually use the accelerator - something that is hard to avoid in 350hp sedans! Don't believe the G8 V8 is going to anywhere close to say a M35 FE wise, more likely what the M45 does. It will be interesting to see what percentage of G8 buyers opt for the 3.6 V6 and FTM how many of the cars end up at the airport.
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Replying to: paisan (Jan 24, 2008 4:54 pm) 
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Replying to: captain2 (Jan 25, 2008 6:13 am) |
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It will be in the APRIL issue of Car&Driver, not March. So we have another month or so to wait.
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Replying to: paisan (Jan 24, 2008 4:54 pm) Perhaps you will not. As posted, the EPA numbers ( and testing methodology ) are substantially changed for the 2008 Model Year. Here are some details: http://www.fueleconomy.gov/feg/fe_test_schedules.shtml Of particular note in the G8 GT \ V8 context: “Beginning with 2008 models, three additional tests will be used to adjust the city and highway estimates to account for higher speeds, air conditioning use, and colder temperatures.” And: “High Speed: Represents city and highway driving at higher speeds with more aggressive acceleration and braking.” The EPA chart for “High Speed” included at the above link clearly shows speeds over 65 MPH & some “more aggressive” acceleration(s). Absolutely not a constant 65. Since ( again \ still ) we do not have any real world reports from actual drivers of production G8s, we can only speculate – and my speculation ( guess ) is based on the following, several specific numbers: Published GTO EPA numbers as they were at the time built. Published GTO EPA numbers as they would have been under 2008 MY testing. A comparison of known GTO & G8 trans. gearing \ final drive ratios & resulting RPM in highway cruising. The fact that DoD \ AFM is included on the G8. And the fact that although I do believe ( based on thousands of miles of driving a 2005 with ) GM’s DoD that the whole engine \ trans. \ final drive gearing and DoD calibration was specifically selected to maximize EPA MPG – to some detriment in the ‘real world’, for those ( like me ) who often drove at highway speeds above those included in the ‘old’ EPA test. Where the G8’s package is likely planned & implemented with the 2008 standards in mind. And highway speeds & acceleration rates more closely resembling what I often utilize, in my real world driving. I certainly hope so, at least. We shall see. - Ray Some GTO numbers: Pontiac GTO 8 cyl, 6 L, Automatic 4-spd, Premium Under 2008 standards \ tests would have been: A4 14 \ 19 14 city 19 hwy Actual stickers were: A4 16 \ 21 16 city 21 hwy The GTO had no DoD \ AFM. The GTO automatic was a 4 speed w/top ( fourth \ primary highway ) gear was 0.7:1: Overall ratio: 2.42:1 ( final drive ratio: 3.46:1 ) G8 GT V8 A6 w/top ( sixth \ primary highway ) gear is 0.67:1: Overall ratio: 1.95:1 ( final drive ratio: 2.92:1 )
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