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As an alternative you might try blending ethanol in your existing vehicle until you find a "sweet spot" that your vehicle runs great on AND you return good mileage. Typical blenders report finding that sweet spot somewhere between e-20 and e-30. My buddy has a Hyundai Accent and he runs straight e-85 every tank.
I blend myself (or use a blender pump when available, but they are few and far between) and have found that e-30 returns comparable or slightly better FE then 89 octane e-10 that I used to run.
I would bet that the ECU in your Elantra will correct for the density differences in the fuel and that your fuel injectors can currently handle at least 50% ethanol in stock form. The only way I could see this tripping a Check Engine light for running lean is if you ran WOT frequently.
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