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Are MPG ratings much less accurate then they used to be?



 
 
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Old July 24th 05, 09:19 PM
gary
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"I can't drive ... 55"



Gary


"tim bur" > wrote in message
...
> they are not far off problem is people do not go the 55 mph the
> calulations
> were done at
> they still use the old standard of 55mph being the national speed limit
> and one
> i feel we need to go bac to so gas starts to stack up at the refineries
> and
> watch how fast the price comes down
>
> gary wrote:
>
>> I thought the ratings were done on a flat road on the moon where there is
>> 1/7th the gravity in order to get those MPG results.
>>
>> I never thought they were very accurate, I only use them to compare one
>> vehicle with another to get a relative ranking when I do a vehicle
>> purchase.
>>
>> "wraithyjeep" > wrote in message
>> ...
>> > Actually MPG is determined by unused energy that is left in the
>> > emissions
>> > it is a chemical analysis with factors of weight and other physics that
>> > overall determines the MPG all this is done on a dyno. in a very
>> > controlled lab.
>> > I used to know the formula (sorry be awhile since I worked in the lab)
>> > the only way to truly achieve the listed MPG is with a lot of down hill
>> > driving.
>> >
>> >
>> > "General Schvantzkoph" > wrote in message
>> > news >> >> When I bought my old Concorde in 94 the MPG ratings were pretty much
>> >> spot
>> >> on, the car got 22 in daily driving and 29 on long highway trips which
>> >> is
>> >> what the window sticker claimed. the MPG ratings for the new 300C is
>> >> 17
>> >> city/25 highway which isn't even close to the real values, I'm getting
>> >> 15-16 in daily driving, just did a 220 mile round trip yesterday and
>> >> it
>> >> peaked at 20 MPG. the article on hybrids (quoted in another thread)
>> >> also
>> >> mentions that the real mileage is nowhere near the sticker values. So
>> >> my
>> >> questions are these, has the method for determining the MPG ratings
>> >> for
>> >> cars changed in the last 10 years? Have manufacturer's gotten better
>> >> at
>> >> gaming the system? How do they determine the MPG ratings? It's hard to
>> >> see
>> >> how Chrysler managed to come up with a 25 MPG highway rating on the
>> >> 300C
>> >> unless they did the test on a road that was down hill all the way.
>> >>
>> >
>> >

>



 




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