With fuel economy at an all-time premium among car buyers, Mazda North American Operations engineers employ some nifty tweaks to the auto maker’s 2.3L direct-injection spark ignition (DISI) turbocharged 4-cyl. engine to eke out a few more miles per gallon. The 2.3L DISI, a multiple Ward’s 10 Best Engines winner, is the up-level mill used in the Mazda CX-7 cross/utility vehicle and Mazdaspeed3 small car, where it is tuned for performance and does not receive the fuel-economy improvements. ...

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