Petrol prices will continue to go up as long as people aren't prepared to live without their cars.
If people are daft enough to pay it, the oil companies are daft enough to charge it, and the governments are daft enough to keep putting further taxes and duties on it.
Only when we all buy either 1.0 urinators (you know, for p155ing about in), or electric cars, or walk, or get a decent public transport system, will we all stop consuming petrol at stupid rates.
And no, cod'ead, I don't drive a gas guzzler before you start.