Well... when I HAD the charger on, I was getting 26-28 mpg highway when cruising, and then when I'm hard on it I get 12-14 mpg.
It's all about how you use it, and how lead-footed you are. It can easily add to your fuel economy if you drive very lightly, but chances are you didn't put FI on to drive more conservatively.
Most people I know that have gone FI actually get better gas mileage. The car doesn't have to work as hard to drive normally. However if you wanna step on it more to feel it all the time, then you'll be using more gas obviously Drive on the streets, save the racing for the track!
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