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I don't think supercharging effects the gas mileage TOO much, but if you have a supercharger, your FOOT will cause the mileage to go down. LOL!
Yeah, usually you will have to run at least 92 octane or it'll ping. And pinging equals KAPOW!
 

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Sounds like you went to the same alchemy class I did...turning foot flesh to lead!

:ahem:
 

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If you're talking a mild amount of boost then you'd probabaly be fine on stock internals. Some 3.8L mustangs have run over 400 hp on the stock internals. Granted they made a few changes on the mustang 3.8Ls but nothing that would make a huge difference until 98 (heavier mains, neutral balanced crank).

I don't expect to get great gas milage with my SC when it's finished..... thats why I have my other bird ;)
 

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I get from 15-17mpg and that's 95% around town (I live 3 miles from work) and minimal (5 miles) interstate. Most of it is warm up and I rarely get into boost on the commute.
 
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