First, let’s look at the right fuel for your Dodge Charger engine. Use regular unleaded fuel [87 octane] for the 3.6L V6 and 5.7L Hemi engines. However, the high performance R/T Scatpack, Daytona 392, SRT 392 and SRT Hellcat engines require premium fuel [octane 91] or higher.
Use regular unleaded gasoline [octane 87] for the 3.6L V6 and 5.7L Hemi engines. However, the high-performance R/T Scatpack, Daytona 392, SRT 392 and SRT Hellcat engines require premium fuel [octane 91] or higher. So be sure to check your owner’s manual for the correct octane rating for your Dodge Charger engine.
In most cases the vehicle will run fine, but you may notice reduced performance and fuel economy. In more severe cases, you may hear engine knock or valve clatter because the fuel is not combusting properly. These things could damage your engine and you should take it to your mechanic.
5.7 liter engine (with automatic transmission)
This engine meets all emission regulations and offers satisfactory fuel economy and performance when using high-quality unleaded petrol with a declared octane number of 87 to 89 as specified by the (R+M)/2 method.
Unfortunately, there is nothing in premium petrol that makes it last longer than other fuels from the pump. Since the differentiator is higher octane, the only real benefit you gain is a reduction in the likelihood of engine knock, which is not a major threat with most modern fuel systems.