From the article: Imagine the more mainstream boats, like bass boats, that can use 20-30 gallons of gas in a day, So taking your minimum... 100 hours a year, a

From the article: Imagine the more mainstream boats, like bass boats, that can use 20-30 gallons of gas in a day, So taking your minimum... 100 hours a year, at 10 hours/day.. that's 10 days * 30 gallons = 300 gallons/year. A car averaging 30mpg, would use 300 gallons to travel 9000 miles. The average car travels 13500m/year.. so that's equivalent to 2/3rds of a car co2. It gets worse for your hardcore enthusiasts... day or two a week.. so 50-100 days or 1500 to 3000 gallons/year. That's equivalent to 45,000-90,000 mi/year.. or 3-6 cars worth of co2. If you have better numbers, then please provide them.. but it doesn't look like it's a co2 savings just for "commercial boats that are often in use"