B 4.3. Is it true that the use of ethanol-gasoline mixtures increases NOx emissions?
NOx (nitrogen oxide) emissions may increase marginally when a fleet uses mixtures of gasoline with up to 10% ethanol. This variation, which is of around 1% on average, besides not being very being significant, is way below that observed for vehicles converted to use natural gas or diesel, the use of which has been promoted as ecologically sounder in many countries, but which may emit 200% more NOx than gasoline-powered engines.
