Aggressive driving lowers fuel economy by 15 to 30 percent at highway speeds, according to the US Department of Energy.

Each 5 mph over 50 mph is equivalent to paying about 29 cents more per gallon.

Natural Resources Canada found tyres under-inflated by 8 psi raise fuel consumption by up to 4 percent and cut tyre life by over 10,000 km.

In the UK, fuel duty of 52.95p a litre plus 20 percent VAT makes tax roughly half the pump price.

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