JONATHAN ADLER: “If Congress really cares about high gasoline prices — even if the gasoline is more affordable than in decades past — they should consider the role of current federal policies in reducing supply, balkanizing markets, enhancing price volatility, and discouraging alternative fuel sources. Yet if Congress won’t even reduce tariffs on ethanol imports — which would significantly reduce the costs associated with current ethanol mandates — I see little hope for more meaningful policy reforms.”