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So, because of this, most of the ways to save fuel that we work on here are those that try to reduce loss. Anti-friction coatings for instance DO work but putting a sheet of plastic under your car will probably have a larger impact on the highway, and slowing down 5mph will have an even larger impact. Taking weight out of your car can save you a few percent in city driving, but turning off your engine at stoplights will save you more and becoming more conscious about the flow of traffic and conserving momentum (essentially preventing having to slow and accelerate the entire mass of your car) saves the most.
That's not to say economy engine builds aren't done, but it doesn't make a lot of sense from an economic perspective to spend $xxxx on exotic coatings when $xx in corrugated plastic will actually help your gas mileage more, and driving modifications are free and will have the biggest impact.
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