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While I may not be able to quantify any real improvement in mileage my feeling is surface drag is much lower than an old oxidized faded finish. Even if not, I would still do the same thing.
I agree with this. A clean car that sheds dirt/water easily (and is easily cleaned topside and bottomside) is one where problems are more easily spotted. As in my above post, anything that causes dirt, bugs, rain, etc less chance to adhere to glass and metal make for better visibility and for being seen more easily.
If it also has the benefit of being a bit more slippery, then it's icing on the cake. It certainly has the benefit of maintaining a higher resale value.
The last few mpg on a 50-mpg car hardly show a cash benefit (where the expectation is 35-mpg EPA). It's no less ridiculous, in other words.
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