[aerohead]

*The 'wing' and half-tonneau,without the blister was good for 9% hwy mpg.
*The blistered half-tonneau was good for 8% by itself.
*The 'wing' and blistered half-tonneau was good for around 10%.
*The aeroshell is good for around 12%.
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*The 'wing'/half-tonneau was really easy to live with.You could just toss stuff into the bed and easily retrieve it.Stuff under the tonneau was protected from wandering eyes and weather.The 'wing' shaded the cab's rear and took a little load off the air conditioner.With Plexiglass,at least on the passenger side,there wasn't any real blind spot when backing out of parallel parking into a busy street.
*The blister did create a rear vision issue.Electronics could easily deal with that today.