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For most Dodge Charger model years and engine sizes, it's recommended to use unleaded gasoline with a minimum octane rating of 89 (or 87 where elevation allows). However, there are exceptions to this rule, so without more details about your specific Charger, it can be tricky to provide accurate guidance. If your Charger has a FlexFuel engine, it can safely run on E85 gasoline, but it's important to weigh the pros and cons before deciding. Additionally, the 5.7L V8 hemi engine needs 91 or higher octane unleaded gasoline when paired with a manual transmission, while the automatic transmission version still requires the standard 89 octane fuel.
Most 2018 Dodge Charger trims like the SXT, SXT Plus, GT, GT Plus, R/T, and Daytona use regular unleaded gasoline. However, the high-performance models such as the R/T Scatpack, Daytona 392, SRT 392, and SRT Hellcat require premium unleaded gas.