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It's a simple weighted average
Posted by Stephen Goldberger (more from Stephen Goldberger) on Thu, 8 Jul 2004 09:32:30
In Reply to: Regarding Gas Guzzler Tax. How is MPG calculated?, J, Thu, 8 Jul 2004 07:44:56
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I think 60% highway, 40% city, but could be the other way around. Note that they use the *measured* numbers for CAFE and Guzzeler Tax computations. Those numbers are higher than the window sitcker numbers, which are adjusted to reflect something that is *possible* in the real worls.
Even better MPG numbers are measured by Consumer Reports, who have a test track where they run a real-world driving cycle with real-world drivers who "just drive the car". The EPA has a carefully controlled driving cycle that designed to measure emissions, not to evaluate a car's potential mpgs. As such, it features some time-based WOT operation that unduly penalizes cars with higher performance.
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