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Old July 24th 05, 06:57 AM
gary
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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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