The manual boost, would that kill gas mileage? Actually, would any or all of these kill gas mileage? Because I want to upgrade the car. But at the same time, I'm also using it to drive half an hour to school everyday. And I'm most definitely not wealthy.

 

Well if u put a mbc on and turn up the boost then ya it'll deff give you a lower gas mileage but not that bad maybe 3 to 4mpg at the most. And yeah pretty much every upgrade will make ur car get less mpg. Its either more hp>mpg or more mpg> less hp