I have a 2010 2.4L SX and I want to know the best way to increase fuel economy? I've done a few searches which have resulted in me using a premium fuel (93 octane; highest octane here) which in fact yielded about 2 more MPG. I usually get about 19 MPG on regular fuel (probably due to my intake and Magnaflow muffler) but with the premium fuel I've seen as high as 21 MPG. It's about 22 city anyway, so I'm not really crying I guess, but I don't want to 'have' to use premium fuel to achieve this, per se... Is there anything else I can do that's cheap/easy? Let me know. Thanks!