Why is that, in politics, no-brainers are usually non-starters.
(1) Lowering the interstate speed limit to 55 mph (and enforcing it) would save thousands of lives and I don't know how many billions of barrels of oil without sacrificing the sacrosanct American standard of living.
(2) Between 2002 and 2008, the feds doled out $72 billion in subsidies to fossil fuel industries and $29 billion for renewables (half of which was for ethanol which is quite possibly even worse than oil)--see eli.org.
(3) When gas hit $4 gallon, people gave up their SUVs and manufacturers dropped plans for new models. When gas prices dropped, SUV sales went up. Americans have short memories--keep a floor of at least $4/gallon under the price of gas and we'll see sustained policy shifts.