need more mpg

[shaughn5.9]

my boss was woundering how to get better mpg's out of our state truck. it's a f550 flat bed. but he is also worryed about the warrenty. what dose it need to get better fuel econamy. and we cant touch the emissions

 

[Cody6405]

If you cant touch the emissions and you are worried about warranty then there is nothing you can do to help mpg.