I pay £140 per year for my car tax and I drive 9000 miles per year.

My car averages 60 miles on 7 litres of fuel (40mpg)  so I use around 1050 litres of fuel per year.

To recover my tax in an increase in petrol prices I would need to pay an extra 13p per litre.

That would increase my weekly fuel budget by £2.60.

I can live with that.