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The point of the taller final drive is to reduce RPM in top gear on the highway, not at low speed. Reduced RPM at cruise will lower your losses from engine friction and accessories. It will also operate the engine in a more efficient condition - lower RPM and higher throttle for the same power, which gives reduced throttle plate losses.
Surely your car has enough 'pep' with stock gears and performance mods to get out of its own way without needing the lower final drive. I guess it's a priority thing - are you prioritizing quarter mile times, highway MPG?
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