Milage?

shooterm1 said:

I just read that Detroit & the EPA have been soft-soaping the MPG figures for years by running their test in a lab with a Dyno on a specially prepared car, never running anything above 60MPH.



:SNSign:

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What you read is only partially correct.

True:

The EPA mileage test is run on a dyno and does not account for wind resistance. A/C is not turned on during the test. Max speed is less than 60 MPH (the test dates back to the 1970s when 55 was the national speed limit). The city test does not include enough time to accurately reflect typical city driving.

Also true, the EPA test is too simplistice to accuratly give real world gas mileage #s. In particular the worst offenders are hybrids as they can really fool the EPA test. In the real world hybrids often get 20% - 40% lower mileage then the EPA test comes up with.

False: There is collusion between "Detroit" and the EPA regarding the tests. Altough it is true that all manufacturers, US, Japan, Asia, Europe really don't want the EPA tests changed because they all know the EPA #s are usually better than reality.

sri dble pst

Your real-world gas mileage will always be worse than the EPA figures, but not necessarily by a wide margin. My Dodge Charger SRT8 is rated at 14mpg city. My last reading for pure city driving was 13.2 mpg and this was with the A/C running full time (though I was careful not to lead-foot it). But my car is naturally aspirated; a supercharged car may be more likely to fail to reach it's EPA ratings.

RED2001GT said:

That depends. I think that 1/2 of the 2007 GT-500 Shelbys that will be sold will be everyday drivers.

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Maybe it's just the people up here. But everyone I know who buys a $45k+ car. Has enough money to afford gas. Whether it be daily driver or not.

351CJ said:

What you read is only partially correct.

True:

The EPA mileage test is run on a dyno and does not account for wind resistance. A/C is not turned on during the test. Max speed is less than 60 MPH (the test dates back to the 1970s when 55 was the national speed limit). The city test does not include enough time to accurately reflect typical city driving.

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The exact figure is 48MPH for which all MPG calculations are done. As you stated in a controlled enviornment without any loads on the motor (other than the tires)