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I typically buy replacement blades that are 2" shorter than the original. I don't think it effects mileage much, maybe a little at highway speeds while operating. I did it for better wiping performance.
The top inch just lets me see the rain drops that are coming down. The bottom inch only lets me see my hood. Since neither is of any concern to me I choose a shorter blade and find that it holds down onto the glass better especially in a strong head wind. I figured that the spring is designed to holds down the standard blade with enough force for "normal" conditions. Since I'm some distance from normal, I'll take the better wiping action of the shorter blade.
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