Hummer officially said that the 2009 H2 and H2 SUT will be equipped with flex-fuel engines capable on running on gasoline or ethanol, making them the first such Hummers available. The 2010 Hummer H3
will be offered with a flex-fuel version of GM's direct injection 3.6L V-6 and we've heard plenty of rumblings regarding diesel Hummers too. Time will tell!