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Puzzled about MPG% vs. .Cd
When it is stated that an automobile can get a certain percentage greater fuel economy by changing its aerodynamics, does this percentage change with the cars MPG average ?
Example : Lets say that I have a car that gets 75 MPG and I change the aero by 50%. Supposedly the MPG will then increase buy a certain percent as a result.
Now lets say I have a truck that gets 4 MPG and do the same - change the .Cd by 50 %.
I would think that the MPG increase would hardly be noticeable, whereas the car getting 75 MPG would see an increase of several miles per gallon.
So I suppose what I am asking is if this is if the math is scaleable
( or something like that )
It's late and I need sleep if none of this is making any sense.
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Nerds laugh at me 
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