I just crossed the Panama Canal in my boat in November 2012. Using an agent, line handlers and rented line the total cost was about $2300, which included a sir charge becasue my boat was measured at 51.5 feet (Over 50 feet)
You should plan on motoring 80% of the Pacific coast... Which means in Panama about $4.25 a gallon for diesel and over $5 per gallon in Costa Rica
. Once your in Mexico Diesel drops to about $3.25 per gallon, but bck in the US you are going to be paying over $5 per gallon again. SO you should probably budget
between $5k and $6k for diesel.
Depending on how many countries check in and out of, you should probably budget
another $2000 for check in/out fees
Two months worth of food
That is known figures... The unknowns, especially with a boat you don't know will be the mechanical breakdowns in foreign countries.
Just yesterday I paid almost $500 to ship an Alternator
to Panama and that didn't include the price
I would ship it by truck...