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On conventional cabs, using Freightliner as an example, they offer a aero and a "classic" body design. Most drivers I know say that with equal trucks the biggest difference they see between the 2 is about 1 mpg and that's in strong (35mph +) Headwinds.
AS far as side skirts etc, I have an uncle whos company spent a couple years carefully evaluating the different systems and they found about zero economy savings vs the cost of maintaining the system. Did not pay for itself at all.
They played with LNG boosted diesel engines as well, and same thing, the maintenance cost overwhelmed the small fuel savings, except when you had a truck who's route was all steep hills, then the power boost of the LNG kicked in and helped the fuel burn on the long 6% rocky mountain grades. But even that simply did not pay.
They also invested in a couple hybrid tractors, and the battery life killed those... They were wearing out the batteries in like 6 months and the trucks needed like 48 batteries at 400 bucks apiece... NO way to make it pay...
Dave
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