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From what I understand, the engine produces 361hp on regular gas and the MPG ratings published by Pontiac are on regular gas as well, although Pontiac recommends premium for better engine performance.
 

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Alexander Haig
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V8 15/24 equal to Charger, better than 550i worse than Maxima, G35
V6 17/25

Comparing (adjusted) rates to what I drive now, I'm only giving up 1 mpg overall.
Comparing to alternate sensible? choices it's a choice of driving excitement or blah.
 

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