Popular Mechanics has a very long, detailed look at alternativbe fuels in the current issue.

How far can you drive on a bushel of corn?
Crunching the numbers on alternative fuels.

For this special report, PM crunched the numbers on the actual costs and performance of each major alternative fuel. Before we can debate national energy policy–or even decide which petroleum substitutes might make sense for our personal vehicles–we need to know how these things stack up in the real world.

To read the entire article, click here.

To hear from the author of this article, check out Glenn & Helen Reynolds Podcast interview with Jim Meigs, Popular Mechanics Editor-in-Chief.