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Interest in natural gas vehicles soared in the 1990s and then faded. Twenty years later, the cost of gasoline is going up while the cost of natural gas is going down. And that difference in price explains the resurgent interest in natural gas vehicles.

In Indiana, Fair Oaks Dairy Farm does more than just produce milk — it is also in the transportation business. The farm owns 60 trucks, which deliver milk to a processor halfway across the state. Last September, most of the trucks were converted to natural gas.

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This is MORNING EDITION, from NPR News. I'm Renee Montagne.

The next big day for Republican presidential hopefuls is Super Tuesday. But on the way to Tuesday, the candidates are making stops in Washington state. Republican caucuses there are set for tomorrow morning.

And as NPR's Martin Kaste reports, with the fight for the nomination still tight, for once the caucuses in Washington state may actually mean something to the presidential race.

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And in Michigan, there's a fight going on over one delegate to the Republican National Convention. Rick Santorum's campaign team says its candidate is a victim of, quote, thuggery. They accuse Michigan Republican leaders of engineering an after-the-fact rules change to give Mitt Romney a slim lead in delegates from last Tuesday's state primary.

We have more from Michigan Public Radio's Rick Pluta.

Greece has taken almost all the action needed to secure a second bailout from eurozone countries, according to the head of the European currency group. The first loan can now be paid out by March 20, as long as Greece completes a bond swap between Athens and private investors, which should cut the nations privately-held debt in half.

Renee Montagne has the Last Word in business.