Has anyone used ethanol free gas. Is it any better or would it be worse for the n than just regular premium
Inaccurate...Octane matters more than anything. Pure gas will give you better mileage but you will actually be down on power because ethanol makes better power.
Maybe I shouldn't have been so quick in my explanation, but we're saying the same thing. Octane matters because knock/pre-detonation and while the car will run the same on a 93 mix or a 93 pure, it's how efficiently it uses that fuel to create the same power. Hence, you'll get better mileage using pure gas.Inaccurate...
Comparatively speaking, oxygenated 93 octane (with ethanol) and non-oxygenated 93 (pure gasoline) will both make the same amount of power in the car. The octane has nothing to do with how much power the fuel provides or the engine can produce, but it's resistance to pre-detonation. Higher octane fuel allows for more aggressive timing without the fuel detonating due to compression/heat prior to the spark plug igniting it. That's why you get "more power" with higher octane in an engine set up for it, it can use an aggressive timing map.
Now, with E-85 you can get more power, but it is at a higher octane rating again, which when tuned for it, allows for higher compression/more aggressive timing.
Ethanol blends come at a cost of efficiency though as ethanol has less stored energy than gasoline, so you have to burn more of it to get equal power.
So, as long as both are at 93 octane (and the Veloster N is tuned for 91 octane), you can use them interchangeably. You'll get better efficiency, but at a higher cost. The stations in my area with non ethanol fuels charge at least $0.10 more a gallon than the ones selling ethanol blend.