If you've had the choice of fuel efflicient car or a non-fuel efficient car, and chosen the latter, then you have no right to complain. You are part of the cause of the problem. Fuel costs are spiralling because demand is exceeding supply. If everyone who gets less than 30 mpg started getting 65 mpg +, then the amount consumed would fall and so would the prices. Unfortunately this step change would have to be world-wide for us to see the difference.
Yes, the government could reduce fuel duty to offset the increased cost of crude oil, but then they would have to raise the money elsewhere; 60% income tax anyone?