Task 2: How will Captain Kwark sail to Griendt?

The boat of Captain Kwark is at the Island Zouteland.
'How can i sail to Griendt'
is the question of the Captain.
What is the shortest way?
If you don't know how the game works, please look at task 1.

Question 1

How many miles is the shortest route?

Question 2

How many liters of fuel are there left after the trip?