Quote:
Originally Posted by DerScotsman
^Well your friend has given you misinformation. It's called Corporate Average Fuel Economy; meaning the average fuel economy of a fleet of vehicles a particular automotive corporation produces. It has nothing to do with an individual model but rather the entire fleet.
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Yes I understand that. But the fleet calculation is done by production numbers.
"A manufacturer’s CAFE is the fleet wide average fuel economy. Separate CAFE calculations are made for up to three potential fleets: domestic passenger cars, imported passenger cars and light trucks. The averaging method used is referred to as a “harmonic mean”. The regulatory language describes the calculation as: “the number of passenger automobiles manufactured by the manufacturer in a model year; divided by the sum of the fractions obtained by dividing the number of passenger automobiles of each model manufactured by the manufacturer in that model year by the fuel economy measured for that model.” The numerical example below illustrates the process. Assume that a hypothetical manufacturer produces four light truck models in 2004, where MPG means miles per gallon and GVWR means gross vehicle weight rating measured in lbs:"
Go to this link
http://www.nhtsa.dot.gov/cars/rules/cafe/overview.htm and scroll down to -How is a manufacturer’s CAFE determined for a given model year?- and they have a graph and calculation right there.
Given that calculation, chevrolet could manufacture the cobalt, aveo impala and maybe one other of the fleet to get over 30mpg to compensate for the camaro and corvette not getting quite that good of a gas milage and THEN make sure they sold X amount of those vehicles so the standard was met. So yes my friend informed me correctly.
