To get the Challenger R/T’s maximum power rating of 376 horsepower, 91 octane rating or higher is recommended. Dodge says regular unleaded gasoline with an 87 octane rating is acceptable, but the R/T’s full power won’t be achieved with the lower octane.
If you opt for an automatic Challenger R/T, Dodge recommends mid-grade gasoline of 89 octane or higher, 87 octane is acceptable; automatic-equipped Challengers are rated with four fewer horsepower and nine fewer pounds-feet of torque than the manual.
The 2010 Mustang GT runs on regular octane to make its peak power; the 2010 Camaro SS recommends premium.
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