There are loads of opinions on here. Lot of great information. My boat has a Bravo 3 Merc gas engine. My husband is a shade tree mechanic. That is part of the reason we bought this particular boat. Most everything we need the fix is easily accessable. We can pull up and fuel up, no paying $4/ gal. I use my Mapco card and points and get up to .15 cents off a gallon for 30 gal. When you are on a budget every penny counts.
When i want to buy something i weight whether i need it or not. What i spend on other stuff on land takes away from boat money. So I cut some things out of my monthly budget. Sat tv went, in favor of broadcast, streaming and roku. Saved $50/there. Getting way more channels so don't miss it. Cell phone company gave me a cheaper plan. All in all, I have $500 a month to spend, barring unforseen circumstances.
When i wash dishes, I get the hot water going, plug the sink, add soap. Its only 2 of us so not many dishes. Soap up and rinse under clean running hot water, pull the plug and done. It conserves water too.