3 ms·
In computing CAFE numbers, the inverse of mpg is used in the average. They are also weighted by sales, so both your points are specious.
by schiffern 14y ago
In computing CAFE numbers, the inverse of mpg is used in the average. They are also weighted by sales, so both your points are specious.
- usaar333 14y agoCorrect. Indeed, they are taking the average of the mpg directly, just the harmonic average (http://en.wikipedia.org/wiki/Harmonic_mean http://en.wikipedia.org/wiki/Harmonic_mean) rather than the arithmetic one we are more familiar with.
- Drbble 14y agoThey should be weighting by miles, not sales, though that is harder to measure.
- kevinpet 14y agoThank you for the correction. I suspect I must have read a simplified explanation once and missed that it was simplified.