Fuel is your biggest moving cost. Track it per trip, not per month
2026-10-01 · 4 min read
Fuel is the cost that surprises operators most, because it is paid in small amounts all month and only added up at the end.
Log it when you fill up
The habit that matters most is the simplest one: write down the litres, the price and the vessel every time you buy fuel. A photo of the receipt on the same day beats memory a week later.
Compare vessels fairly
Two boats can burn very different amounts on the same route. Once you log fuel against each vessel, you can see which one is costing you more per trip and decide whether it should take the longer runs.
Price the trip with fuel in mind
When fuel prices move, a charter quote from last season may no longer leave you a margin. Looking at the real cost of the trip first makes the price you quote a decision, not a guess.
Do not forget the other fuel
Electric and hybrid vehicles, generators and engines that use different fuels all need their own line, or your totals will not match reality.
Harborline records fuel by vessel and includes custom expense categories, so your reports show what each boat really costs to run.