Work out roughly what a trip will cost in fuel, using your towing fuel economy rather than your unloaded figure — towing usually adds 30–50% to your normal consumption.
Work out your trip fuel cost
Estimate only — wind, hills, load and driving style all move the real number. Don't know your towing economy yet? See the Caravan Fuel Economy Calculator and How to Estimate Caravan Towing Fuel Costs.