I think you can also get away with 87 octane on the 3.6R motor, whereas the 2.5GT still needs 91. So, overall, I'm actually more in favor of the 3.6R if you want the extra power (and won't be modding your car).
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While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN
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