Here's one of the best stories I can come up with on short notice. A while back our very nice yet Sea Ray owning dock neighbors told us they wanted to meet us in Catalina on a Friday afternoon. So I kind laid things out for them, told 'em we'd be leaving at 1000 for the 5 hour sail over there and if they left at 1400, it would probably be a tie. So we fire up the big Perky that we have, motored for 15 minutes out of MDR and sailed a reach the rest of the way at 7 knots plus. Absolutely perfect day. We got a mooring just before 1500 and fired up the stereo, **** tails and hor's doeovres. Our freinds didn't show up 'til almost 1800, after pumping 300 bucks in gas into there tank, then dealing with not only a clog filter, but eventually an electric fuel pump, somehow delivered by Boat U.S.. Big money...
Anyways, after spending a few days together, we fire up our motor for maybe ten minutes, drop the can and have another sail back just like the one out. They didn't get back in 'til 9 p.m. that night, 'cuz they had to top off their tanks once again in Avalon(another 2 hundred something) plus they had to change filters twice on the way back.........
The moral, and point here, is that we spent less than $4.50 on fuel and didn't have to listen nor smell exhaust for too long, and enjoyed 10 wonderful hours in complete silence, while our friends went through over 4 bills on fuel alone, not to mention the pump and filters. And the time spent upside down in the engine room upside down and rolling like a tin can for a few hours.
That right there should answer all of your questions. Good luck,