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1) What is the final drive on the Hyundai? The overdrive gear is only half of the equation. The Saturn has a 4.06 final.
2) The Saturn's BSFC sweet spot is pretty good and certainly not far off more modern motors, but the low load stuff just can't compete with newer VVT Direct Injection stuff. As far as I can tell the DOHC engine has better BSFC numbers than the SOHC engine, however is mated to a more performance transmission. A MP2 trans with DOHC motor is probably the best bet for mileage.
3) As said above, Cd is only part of the CdA. Lowering the area is quite easy. Pass mirror delete (from SL, combine with a Wink mirror), and lower the car. 2" is pretty easy to do and will drop the A by a reasonable amount (~4%). This can potentially reduce the Cd value as well due to a much tighter wheel-body fitment reducing air turbulence in there. What is the Hyundai's CdA?
4) Depending on the model you choose, a curb weight of way less than 2400lbs should be achievable. A manual 2G sedan without a sunroof should easily be in the 2200s. 100lbs is quite easy to lose off the car as well between the battery, spare tire, and wheel/tire combos.
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