I've noticed that at 100 mph in rain/wind on concrete (seamed) roadways, the Yokohama Advan Sports on the base/touring feel a mite skittery. I'd want the 1" wider tires of the sport package (and probably better nose downforce).
The rest of the time, standard highway driving conditions and speeds, I'm probably getting around 5% better gas mileage. (This will improve even more when I sacrifice some grip to get All-Seasons late this fall.)
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