Originally Posted by 69superbee383
I could burn regular in both my 5.7 and 6.4. I am thinking these things will require premium. Around here that’s close to a dollar a gallon difference so I wonder if the improvements in MPG will be offset by cost.

Looking at how that thing is built I would hate to have to change a turbo. I think I will wait and watch. See how this thing holds up for awhile.


The 540hp H.O requires premium. The 420hp version does not