Why aren't cars dimpled like golf balls if it increases fuel efficiency? [more inside]
posted by tehloki on Oct 25, 2009 - 28 answers

What is the optimal speed for fuel-efficiency for my car? Do I really have to drive 55? [more inside]
posted by scblackman on Jul 11, 2008 - 18 answers

Help me solve two MPG (and car) related arguments [more inside]
posted by revmitcz on Apr 29, 2008 - 25 answers

Gas has been getting more and more expensive, yet cars have not been getting more fuel efficient. Why not? [more inside]
posted by Dec One on Feb 18, 2008 - 47 answers