I have obtained more than 20pgUS on a few occasions by doing none of what you did on a much much older & bigger vehicle, packed with gear/people with nearly 240,000 miles on the clock.
What is the cost of some of the applied dark science you speak of? Did it offset the savings in fuel consumed?
Wouldn't it be easier to start out with a vehicle that could get awesome fuel economy to begin with, then apply the dark science and impress?
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2013 Honda Civic Si - 2.4L
OEM front to back belly pan from the factory.
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