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I have a modified 2008 subaru wrx sedan currently getting a new block right now. i am going to be driving it 1000+ miles in a month and was wondering what are some ways i can get better MPG. i currently get 15 city 18 highway.... not to great for a 4 cylinder. obviously the tune is the main reason why its sucking my gas tank but just to save a couple mpg would be a huge help if anyone could give some advice.