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Just a quick update...
I'm really impressed with the Royal Purple fluids. I added the Maxgear 75-140 to the rear end, no friction modifier necessary--smooth and quiet. Not that I was having any rear diff noises before, just wanted a better fluid with better protection. Love the Synchromax in the trans too, shifts are smooth and slick and the trans does seem a little quieter.
I also added a K&N drop-in air filter. Seems like it feels a little more responsive. Just drove the GTO to the Florida coast last night, 356 miles in a little over 5 hours. Averaged 23.5 mpg running 80-90 mph with the car packed pretty well (that's better mpg than my wife's minivan with an anemic v-6). And I still have 400 hp on tap to get around the slower drivers. I swear there were several times I'd look down and find myself doing 100mph+ and never had a clue... it's so smooth. I love this car!
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