Wax on, wax off
June 29, 2011 9:05 AM Subscribe
Does a clean, waxed car REALLY increase fuel efficiency?
posted by Kronur to science & nature (11 answers total)
It's been over 10 years since I took fluid dynamics, and I keep hearing that a clean, waxed car will increase your fuel efficiency (there were recently some "Good Cents" radio spots on my local NPR station extolling the virtues of waxing your car). Something just doesn't feel right to me about that assertion. I don't deny that a smoother surface generates less friction, I just don't think that the average driver (not racing driver) would really see an efficiency benefit from keeping their car freshly waxed.
(Assume an average sedan with some dirt, but no bird nests or piles, during highway and city driving)