The Abrams runs on a turbine engine but it does not need to have the ultra consistent ignition rate that a turbine engine say in a C-130 needs so you could convert it to run on other things.
According to Honeywell who makes the turbine engine for the Abrams it can run on jet fuel, diesel,gasoline, and marine diesel it does not specify if anything must be done planning to run on on type or another long term but my guess is that some minor conversion might be required to make it run properly long term on greatly differing duel say normally jet fuel and then switching to gasoline.
You would have to view a T.O. on the maintenance of an Abrams tanks to know for sure and most likely you wont be able to acquire that information.
http://www51.honeywell.com/aero/comm...Technology.pdf