Rumors about being corrosiveThere have been many rumors going around that E85, which is biodegradable in water, can corrode a vehicle's fuel system, including the fuel tank. Although E85 is corrosive, it is not much more corrosive than regular gasoline. The chemical properties of E85 are not what causes the corrosion; it is the water in E85 that may cause rust and block up the fuel system. In fact, gasoline also contains water, which is why vehicles' fuel systems are built to resist and prevent corrosion.
Vehicles today (mid-1980s and later) are built to withstand and resist corrosion, which means E85 is very unlikely to harm or corrode a vehicle's fuel system in any way