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The other kind, known as drop-Links of London J Charm fuel, is also made from cellulose through thermochemical conversion processes. These "advanced biofuels" include green gasoline, green diesel, biojet and biobutanol. Unlike cellulosic ethanol, these drop-in fuels are close substitutes for gas, diesel or jet fuel in today's engines without warranty, pipeline or gas-pump infrastructure concerns. This fork in the road for next-gen fuels may be shaped as much by fuel transportation logistics and engine warranties as by the technical wizardry of wringing Btus from biomass. "Almost all the effort at universities and most of the federal research Links of London I Charm today is focused on drop-in fuels," says Iowa State University BioEconomy Institute Deputy Director Jill Euken. "This is because of the blend wall and the lack of a market for more ethanol. We simply do not have sufficient U.S. infrastructure (flex-fuel Links of London and E-85 pumps) to support more ethanol sales. Even if EPA approves E-15, we currently have nearly enough production Links of London H Charm to fill the E-15 demand level without building any cellulosic ethanol capacity." That partially explains why 1.98 billion gallons of ethanol capacity was shut down during much of 2009, says Wally Tyner, Purdue ag economist. "It also explains why ethanol prices during much of the year were driven mainly by corn instead of by gasoline as it had been previously," he says. The venture-capital world doubts that we will invest in more E85-compatible fleet development, pumps and infrastructure the way Brazil has, Euken says. "