What is the carbon footprint for the US MSD program?

[SecondBase]

I'm trying to estimate our annual carbon footprint for the Marine Sanitation Device program here in the States to the nearest ton.

Loose (very loose) numbers:

Roughly 16 million US pleasure boats
https://www.statista.com/statistics/...ats-in-the-us/

Assumptions (can be improved)

- 25% (?) of the fleet is fitted with MSDs
- of that 25%, all boats are 2% (?) larger to include waste tanks
- the average holding tank is 10 gallons (?)
- the average holding tank is half full (?)
- a gallon of water is 8.34 pounds

So the MSD program weighs (maybe) 160,000,000 pounds?

Given those numbers (or more accurate numbers) how many gallons of additional fuel are burned each year by recreational boaters?

If this is all laid out in the original Environmental Impact Statement (EIS) for the reg please share the link.