Different fuel blends burn at different rates under the same temperatures and pressures. Absolute fact. All gas doesn't burn at the same rate, there are many, many variables that determine the burn rate of gasolines, and most all fuels for that matter. But, not to argue the point here, non alcohol fuel is better for our engines. I use it in all my gas engines including my 5.0 Mustang. You'll get better mileage from "clear gas" also. On the other hand, the higher the alcohol content of the fuel the greater the power available if tuned for that alcohol. That's why we use alcohol in our race cars. We can run ridiculously, crazy high compression ratios (16 to 1) with alcohol and it runs cooler to boot but, we have to use a lot more of it for equal power to gasoline.