Hyundai vehicles equipped with carburettor fuel supply systems should not be run on Ethanol blended fuel of any ratio. This is due to both the incompatibility of the fuel lines with the moisture holding characteristics of Ethanol, and to the negative effect on vehicle performance due to the variation of vapour pressures between petrol and Ethanol. Ethanol is hygroscopic, (attracts and holds moisture), and can therefore accelerate corrosion. The use of E10 (Ethanol blended fuel) may result in negative effects to cold starting, as well as engine driveability (‘smoothness') at light to medium engine load conditions. It will also result in reduced fuel economy.