On my 2002 Elantra I know it take a LOT of power from the engine, never checked the MPG but when I turn the A/C on you feel the car jerk "back" right away (it slows down quite a bit). This is a know problem on this generation (2001 to 2006) but it was fixed later (2007 and up).
My best FE with the A/C on was 6.4l/100km (almost 37 MPG) on a highway trip, so I'm guessing I could've easilly gotten above 40 MPG if I had turned the A/C off!
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