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I'd say get the SI too. That's what I'm doing.
Gas is like an extra $3.9 per fill up from empty.
Mileage:
SI 22/32
Non SI 30/38 (manual)
Get like an extra 105mi per tank on non SI.
With the money you'd spend though to get that extra 40hp (still 17 less then SI) I'm sure it would've been better to just buy the SI.
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