Call us skeptical, but what works for a round ball flying through the air might not have equal success when applied to an automobile. Not being aerodynamicists, we'll wait for independent test results to either verify or debunk the FastSkinz claims of an 18-to-20-percent fuel economy improvement. In the past, such large gains have been merely fantastical PR noise, and FastSkinz's own documentation is buried in acronyms and tends toward the obfuscatory; basically purporting that a vehicle wrap will substitute for reduced frontal area and a low coefficient of drag. There are also some equally uninformative videos, none offering the sustaining manna of clear understanding. Automotive airflow techniques are at the highest level of practice in racing, and you don't see mottled F1 cars. What those racing cars do sport, however, are other techniques of controlling and manipulating airflow, which are actually effective.
[Source: FastSkinz via MaxGladwell]