KEEPING TRACK OF costs when touring is a struggle, but the Road Trip app for the Apple iPhone is a cracker.

As well as letting you log the cost of fuel fill-ups, it permits you to log the purchase in the local currency, and provides an up-to-date exchange rate so you know what you are paying.

Enter the mileage between fill-ups and it gives you a rolling economy figure, cost per mile and extrapolates the cost going forward so you can project your costs too. Bring up the map and you can plot the GPS position of the place you are filling up in two.

A free version call Road Trip Lite is available but this lacks the foreign currency options and data cannot be exported. Road Trip is available to download from the Apple App Store.