Methanol has been propose as a fuel for internal combustion and other engines, mainly in combination with gasoline. Methanol fuel has received less attention than ethanol fuel as an alternative to hydrocarbon fuel. However, in 2005 Nobel prize winner George A. Olah advocated an entire methanol economy based on energy storage in synthetically produced methanol, in an essay and in 2006 he and two co-authors published a book around this theme.