E85 fuels,  why are all the turbo guys doing it and why should you have it? So what we have here is 91 and E85 and we're going to set them on fire and we're going to show you the difference , so here I'm going to light the 91 you can see that's a pretty big flame and we're going to light the E85 ,  pretty obvious example , you can barely see the flame come out of the E85 and see a big flame out of the 91 and if you watch as we let it burn for a minute ,which I don't recommend doing at home , you can see the cap's melting , see look at that it's already melting on the 91 and the E85 hasn't even begun to melt , it's already destroying the cap so the reason behind the fires being different is E85 or ethanol has a lower heating value than …