2005 Dodge Neon Owner Manual SRT-4 - Page 121

STARTING AND OPERATING 121 SELECTING FUEL 2.4L TURBO Your engine is designed to meet all emission regulations and provide excellent fuel economy and performance when using high quality unleaded gasoline having an octane rating of 91. The purchase of higher octane is not recommended. High quality unleaded gasoline having a minumum octane rating of 87 may safely be used for your vehicle. Use of these lower octane gasolines, however, may result in reduced acceleration performance. If low octane fuel (below the recommended 91 octane (R+M)/2)) is used, boost will be reduced significantly. Normal boost levels will return once the recommended fuel is used and the engine controller adapts to the fuel octane level. Spark Knock Light spark knock at low engine speeds is not harmful to your engine. However, continued heavy spark knock at high speeds can cause damage and immediate service is required. Poor quality gasoline can cause problems such as hard starting, stalling and hesitations. If you experience these symptoms, try another brand of "regular" gasoline before considering service for the vehicle. Over 40 automobile manufacturers around the world have issued and endorsed consistent gasoline specifications (the World Wide Fuel Charter, WWFC) to define fuel properties necessary to deliver enhanced emissions, engine performance, and durability for your vehicle. The manufacturer recommends the use of gasolines that meet the WWFC specifications if they are available. Reformulated Gasoline Many areas of the country require the use of cleaner burning fuel referred to as Reformulated Gasoline. Reformulated gasolines contain oxygenates, and are specifically blended to reduce vehicle emissions and improve air quality. 5