If you have E85 around you, 2.5 gallons per fill up will make a massive difference with 91 or 87. It really helps with low end torque especially on hot day.
In the EB I NEVER used the paddles, because I wasn't used to them and they were never where I "needed" them come time to shift, plus I would have to moved back to D then S to resume automatic mode. In the GT, however, I can use the paddles even in track mode to better anticipate needing that rev match, and after a few seconds the paddle icons flash and it resumes automatic mode. Really nice, just think it could hold a little longer. Thanks for this tip, I'll try it out!
IIRC if you put the shifter into "s" the notch after D. and in sport+ or track it'll hold the gear untill you paddle up or down and not time out to automatic if you don't use the paddle for a set time.
Track with shifter in S is how my car is always driven. The rev matching feels much better than sports plus jerky downshifts. I found the holding upshift paddle back to automatic mode by accident but it changed the way I drive and use the car tremendously. No touching the shift anymore.