• The RFA E15 Retailer Handbook provides regulatory and
technical guidance to fuel retailers that store and sell E15
ethanol blends. The handbook provides sample checklists
and questions potential E15 retailers should contemplate
before offering the blend. RFA technical staff offer free
retail equipment compatibility assessments that determine
equipment changes or upgrades needed to offer E15.
• The RFA offers comprehensive E15 information for fuel
Biofuel opponents blame ethanol for corrosion in underground storage tanks (USTs), but ethanol is not the culprit.
Beginning around 2007, UST owners reported severe,
rapid corrosion of internal metal components in their diesel
fuel tanks. The reports typically described severe corrosion
of equipment in upper portions of UST systems in the areas
generally not submerged in fuel. Before 2007, corrosion
risk in diesel fuel tanks was considered minor. If corrosion
in a diesel tank occurred, it often appeared in the wetted, or
lower, portions of the tank. Because of the sudden change,
many parties started searching for the cause. Ethanol quickly
became the scapegoat; it emerged across the country around
that time. But blaming ethanol raised other questions:
• Why would ethanol be in diesel fuel stored in these
• Where would ethanol have come from?
• Why were we not seeing corrosion to the same degree in
tanks that had been storing ethanol-blended gasoline for
• If ethanol were the cause, why did problems not begin
decades earlier in the Midwest when ethanol was introduced in the region?
The EPA began researching the seriousness and extent of
the corrosion. The agency held discussions with UST manufacturers, service and maintenance providers, retailers, fuel
producers and others and worked collaboratively to develop
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