Ethanol is made by fermenting and then distilling starch and sugar crops such as maize, sorghum, potatoes, wheat, sugar-cane, fruit and vegetable waste. The addition of ethanol increases the oxygen content in petroleum. It is sometimes referred to as 'Oxygenated Fuel'. Ethanol also raises the octane rating of fuel.

Hyundai vehicles equipped with Fuel Injection (petrol) manufactured after 31st October 2003 are equipped with fuel systems compatible with alcohol (Ethanol). These vehicles can operate on a maximum of 10% Ethanol / 90% unleaded petrol, however if drive-ability is affected, the use of 100% unleaded fuel is recommended. Ethanol blended fuel mixed at 10% is generally referred to as E10.Hyundai vehicles equipped with Fuel Injection (petrol) manufactured before October 2003 do not have fuel systems compatible with alcohol (Ethanol). If Ethanol is to be used in these vehicles, then a maximum of 10% Ethanol / 90% unleaded fuel (E10) can be used in conjunction with periodic use of a fuel corrosion inhibitor. (The Hyundai recommended inhibitor is available under part number AL009M0002)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.

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 drive-ability (‘smoothness') at light to medium engine load conditions. It will also result in reduced fuel economy.

The use of Ethanol at E10 will not affect warranty simply by its use. However, failure caused by Ethanol such as corrosion of fuel injection due to Ethanol's' hygroscopic nature (attracts and holds moisture) will not be covered by warranty.

Ethanol has less inherent ‘heat energy' than petrol, resulting in an increase in fuel consumption (approximately 3% ~ 8%) when blended at 10% with petrol. When mixed with petrol, the Reid Vapour Pressure (which directly effects cold starting performance) is affected. The octane rating of Ethanol is approximately 112 RON, and will raise the octane of the blended fuel. As Hyundai engines achieve best performance and economy with 95 RON fuel, no significant performance gains will be achieved at higher octane ratings.

The octane rating of Ethanol is approximately 112 RON, and will raise the octane of the blended fuel. As Hyundai engines achieve best performance and economy with 95 RON fuel, no significant performance gains will be achieved at higher octane ratings. The use of E10 (Ethanol blended fuel) may result in negative effects to cold starting, as well as engine drive-ability (‘smoothness') at light to medium engine load conditions. It will also result in reduced fuel economy.

All Hyundai models manufactured after October 2003 are equipped with alcohol tolerant fuel system components. The use of Ethanol blended fuels in any Hyundai vehicles manufactured before October 2003 is not recommended. Hyundai Motor Company includes the following comments in the owner's handbook: "Gasohol (a mixture of 90% unleaded gasoline and 10% ethanol or grain alcohol) may be used in your Hyundai. However, if your engine develops drive ability problems, the use of 100% gasoline is recommended. Fuels with unspecified quantities of alcohol, or alcohols other than ethanol, should not be used. customers choose to run with up to E10, HMCA recommends that 1 in 5 tank fills is with 100% petrol.