THE cost of filling up a Honda Civic's 50-litre tank varies hugely around the world. Where some countries subsidise, others tax heavily. Pity Turkish drivers, who fork out $93.83, according to Gerhard Metschies in Foreign Policy magazine. Re-nationalised oil companies and heavy subsidies keep Venezuelan motorists happy, though those in Turkmenistan fare even better, paying only $1.06 a tank. Despite protests over rising prices, filling up in America is relatively cheap at $31.06. Indeed, this may explain the country's enormous daily petrol consumption, which in 2003 was more than the next 20 biggest consumers combined. Although consumption will have increased in some countries since then, particularly in China, it is nonetheless easy to see why George Bush has introduced a plan to cut petrol consumption by 20% in the next ten years.