Do not wait until gasoline prices at the pump reach 5 dollars a gallon.
Do something now.
Pretend the gas prices are that high already.
Keep the difference and spend it as you yourself see fit, earmarking it for purchases or donations which will benefit environment and conservation, f.e. wind power electricity credits or more efficient home appliances.
It's better for you to decide how to spend this money than wait for the oil companies to jack prices up or for the government to increase taxes to feed its bureaucracy.
It will be money well spent.