Quote:
Originally Posted by JulianEdgar
It doesn't even need any reference citations to prove this is absurd. (But as a bonus I previously gave two references that show this not to be the case.) Just think about it for a minute. Given that rolling resistance (the other determiner of fuel consumption) changes little with cars of different CD, how can this rule of thumb validly apply to cars that might vary in CD from 0.5 to 0.25? To put it simply, the proportional change might be to something making up half the total vehicle resistance, or one-quarter! And yet the outcome is the same?
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Sure you could have vehicles with the same rolling resistance and wildly different CD, but when I think of specific examples they seem to have a positive correlation. You say .5 CD I’m thinking hummer H2 has some serious rolling resistance, You say .25, I’m thinking insight. I always thought the 5/10 was more just a rule of thumb