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can't speak on the Gen II cars, but i've owned Gen I cars with similar final ratio differences (3.91 versus 4.08). i will say this, if you were to put a stopwatch on it, there may be a discernible difference, but as far as my tooling around town was concerned, i didn't notice a difference.
as far as gas mileage was concerned, i can't say i noticed a difference there, but in all fairness, i only started tracking mileage qunatitatively when i was running the 13B (Dell'Orto and exhaust) with the 3.91 rear and i averaged 24 to 25.5 MPG on the highway. i didn't feel i needed to calculate city mileage because i commuted almost exclusively on the highway.
i hope this helps you some.
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