Re: turrets, autoloaders etc are electric anyway
The Abrams was given an APU to handle idle ekectrical requirements post the 1991 first Gulf War (or really the second Gulf war because the Iran/Iraq one deserves to be called the first). The APU means that you don't have to run the turbine engines to generate power for boiling a cup of coffee or running the thermal sights while holed up. As a result the fuel consumption of the Abrams in the field is now pretty much on a parr with that of contemporaries like the Challenger 2 and the Leo 2.