Grit dog wrote:
Not having driven Eco boosts much (the topic of discussion here) I cant say what the performance difference is on premium gas.
But, other vehicles make a notable performance difference if designed to run on premium compared to pulling timing to run on regular.
Not like OMG 100hp, just added a blower to it difference but real seat of the pants difference.
Yeah, my wife's Infiniti and friend's GMC 6.2L are this way, and both are designed and tuned to run on premium as the preferred fuel. You can tell a different performance wise if you don't run premium, but they can run fine on regular for the most part although my friends 6.2L will start to knock during the summer months when the weather gets hot even unloaded.
My old Ecoboost on the other hand was designed and tuned to run on regular fuel as its preferred fuel, but you could not tell that much of a difference if you added premium. There was a difference, but it wasn't really significant or nearly as much as the difference my 5 Star custom tunes made. But those added over 50hp and 100 lb-ft.
