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One of those options requires a complete engine replacement, turbo installation, and complete fuel management and ecu alterations, and when tuned for economy will still require more costly premium grade fuel and will only result in a power up which most likely will yield identical FE but faster drive times. One of those options requires the relocation of parts already provide with the vehicle and utilizes an unused engine by-product. Tell me which one costs less, frees up rotational mass, and could maybe eek a tiny bit of FE back out of an engine? :-)
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