Yes sir, even one heavy foot run per tank hurts mpg, I know not only about that but about how hard the temptation is to resist.
I almost assume yours is a GN edition?
Because the hardest times I had and have dealing with the WOT temptation is in a T-bird 5.0, also the bmw 325 and even my 3/4 ton truck half-loaded weighs 3.7 tons you would think there's no sense but I assure you it is hard to resist that 400hp engine (the speedo goes past 120 and I've never done it but I believe it would lol).
Heck I finally got away from WOT then it dawned on me that even 3/4 throttle was hard on it, but I can tell you one thing it did help in the early days: When you absolutely must WOT, go 3/4's instead > You still get most of the pleasure of the WOT but it helps your mpg.
That's how I started, go 3/4's to get away from the 'Wot of mpg death'
1/2 down is fun too, you just have to think "the effect lasts longer this way"
When you're down to 'feeling' it between 1/3'rd to 2/3'rds of wot you're on your way.
Next comes the ultimately brain buster, never step on it (but that's way past 3/4's).
Because even ONE heavy footing the entire tank affects mpg...
THAT took the longest to master, to never step on it at all, still I'm not perfect.
..........
Other notes of interest: Driving a high performance car is about control.
It took me many years to realize this control refers to never stepping on it.
Control is knowing you have it, then not using it, ever.
That's what they really mean by control, wow that hurt to learn this.