Have the escapades of Clarkson, Hammond and May got you craving a Grand Tour of your own? The new Amazon Prime motoring series has already visited Los Angeles, Morocco, Johannesburg and, er, Whitby. But where should you go if your budget is limited?

The map above is a good starting point. It shows the world according to the cost of petrol, as listed by the website globalpetrolprices.com on December 12.

Unsuprisingly, the Middle East looks like a fine choice for road-trippers on a shoestring, with Iran, Qatar, Bahrain, Kuwait and Saudi Arabia among the 10 cheapest countries. Central Asia also looks a good bet, with Turkmenistan fourth cheapest, Kazakhstan 12th, Azerbaijan 15th and Kyrgyzstan 20th.

Venezuela, where petrol prices are ludicrously low

But it is Venezuela that tops the charts. Thanks to a policy of heavy subsidisation, and despite threats by president Nicolas Maduro to hike prices, petrol costs just $0.01 a litre, according to the fuel analyst website. That's just one per cent of the global average, $0.97.

The 10 cheapest places to buy petrol

Venezuela - $0.01 per litre Saudi Arabia - $0.24 Algeria - $0.28 Turkmenistan - $0.28 Kuwait - $0.34 Egypt - $0.34 Ecuador - $0.39 Iran - $0.40 Qatar - $0.41 Bahrain - $0.42

"As a general rule, richer countries have higher prices while poorer countries and the countries that produce and export oil have significantly lower prices," explains the website. "One notable exception is the U.S. which is an economically-advanced country but has low gas prices."

No wonder the US is such a popular choice for a road trip. Not only does it offer cheap fuel ($0.65 per litre), but it has more national parks than you can shake a stick at and Route 66, perhaps the world's most iconic highway. Other enticing driving destinations with below-average petrol prices include Namibia ($0.75), Mongolia ($0.76), Canada ($0.87) and Australia ($0.91).

Hong Kong: leave the car at home Credit: leungchopan - Fotolia

The most expensive petrol ($1.90 per litre) is found in Hong Kong, while the UK ($1.43) is also among the costliest spots, at 151st out of 170. Scandinavia also has some of the steepest pump prices.

The 10 costliest places to buy petrol

Hong Kong - $1.90 per litre Norway - $1.73 Iceland - $1.71 Monaco - $1.62 Netherlands - $1.60 Israel - $1.59 Denmark - $1.55 Italy - $1.55 Greece - $1.53 San Marino - $1.51

Those planning a road trip might also want to think about safety. The map below shows the safest (and most dangerous) places to drive, according to the World Health Organisation.

Most of the bottom 10 - including Eritrea, the deadliest driving destination, according to the World Health Organization's figures (with 48.4 deaths per 100,000 residents), Libya (40.5) and Iraq (31.5) - are unlikely to feature on the travel itineraries of most Britons. But a couple - Thailand (38.1) and South Africa (31.9) - are popular holiday destinations. Relatively risky roads can also be found in Ecuador, Vietnam, Brazil, Paraguay, Kenya and Laos.