Feb 05, 2013
Thanks for the request. "Blend" pumps were quit common back the in '70s. Out here, Hancock (later Wilshire) stations had them, and you could "dial up" any octane you wished from 94 to 100 RON. Now, they're doing it with ethanol. My experience with carbureted engines is that 10% (which is now mandatory here) yields about 5-10% less economy, while MPFI engines lose about 3-5%. Considering that ethanol is renewable, it's a good deal. Any "damage" I've gotten from ethanol-blended fuel so far? It doesn't like rubber hoses used in evap emission systems, and that's about it. No traces of rust anywhere in the fuel or intake system at all. However, anything above 10% would introduce more moisture into an older system, and there could be corrosion problems in fuel tanks and lines. Obviously, "flex fuel" vehicles, with stainless lines, beat that problem. A lot of the "no ethanol" crowd are composed of whackos, from my direct experience.