Seventy percent of the price of unleaded petrol now goes to the chancellor in tax.
This is the highest proportion for almost six years.
Road users are now paying four times more money to the Chancellor in motoring taxation than is being spent by the government on the roads.
This chart shows the price of Brent crude over the past 12 months both in US dollars and pound sterling. Hover over the lines to get precise data values.
Within twenty years there could be another seven million drivers in the UK. This means that if current trends persist, the total will leap from about 36 million to 43 million.
This chart tracks the changes in petrol and diesel prices over time (weekly, rolling ten year period) and is based on DECC data published each Tuesday.