Dave,
We just returned from 10 days aboard a Leopard 43. We ran the engines a bit at night to recharge the batteries and sailed most days. No AC, we ended up topping off the tanks at the end with a total of 20 gallons so aprox $100 for fuel.

"We lost our corkscrew and were compelled to live on food and water for several days.
~W.C. Fields"