Talk:REC-90

This article is very ambiguous regarding the fuel formulation and labeling, 90 octane "ethanol free" may not imply "rec-90". Most normal on-highway gasoline in the USA is oxygenated, ethanol is the most common oxygenator but not the only additive that can be used for this, thus you can have oxygenated non-ethanol highway fuel. The name Rec-90 implies off-highway use, and off-highway uses are not required to have any oxygenation additive at all. Is Rec-90 a "reformulated gasoline"(oxygenated with other than ethanol), a non-oxygenated fuel,or a generic slang term that covers both? Aviation gasoline as an example of off-highway fuel, actually prohibits oxygenate by specification, and it goes further by adding a small amount of anti-oxidants. The difference is important because it is oxygenation that directly effects expected storage life not ethanol specifically, as it slowly oxidizes the hydrocarbon base to form gums and varnish compounds. Ethanol specifically adds moisture absorption considerations to the oxidizing issue. Many purchasers of rec-90 or other non-ethanol fuels are explicitly looking for improved long term storage characteristics.