TomTom has announced that its latest satellite navigation system, the Go Live x40, is the first to contain a petrol price-tracking tool.

In the current economic climate (are you fed up with hearing that yet?), an automated tool which helps motorists to find the cheapest petrol is arguably more useful than having access to all the historic landmarks in Dorset (great though that is).

In fact, TomTom has calculated that each driver using the system could save an average of £162 every year (based on the user driving an average of 12,000 miles per year, 7.4 miles/ litre, at a saving of 10p per litre, in case you were wondering)…