Going from a 26" tall tire to a 28" tire changes gear ratio from 3.55 to 3.30 according to Wallace racing Chart. Going from a 3.55 to a 3.36 AND getting slightly taller tires could get you pretty close to where you want to be.
Unless the car runs quiet, I hate highway driving at anything above the lowest rpm possible. Aiming for 2000-2400 rpm at between 50-60 mph is kind of a middle point if driving is split much between city and open freeway. And getting a little above 2500 rpm should get you close to max toque production, so passing/acceleration should still be decent
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