Yes, forgive my poor English.
I was looking at the fuel consumption. I gave you the speed and rpm to see if your 6-7 GPH is because of different propeller than mine.
I bought this boat because it's been 3 years i'm wakeboarding behind a friend's Mastercraft X35 (of 2009) with 8.2L 450hp engine. He wants to sell it this winter, so I looked for an as roomy and confortable boat, for 8-10 people with good wake. The X35 3 tons monster drinks 35L/h. It ran 31km/h @ 2800rpm.
I hope my Saltare will burn less fuel. Here 1L of unleaded 95 octane (RON 95, MON 85) fuel (E10, 10% ethanol) is 1.48€

I will calculate it next season, but if it's over 25LPH, I will think about swaping the 454 for a 350 ... We (my friends and I) do 100 hours per year of wakeboarding, so I really need an efficient boat. I don't plan to ballast it, or maybe to clean the wake (with iron cast pieces), but we often are 7-8 people onboard and the actual wake seems cool for us.

What wakeboard tower model do you have on yours ?