BlueS5

This one is directed at those got there 7 in stock trim, drove it for a while, and then modified it. I'm thinking modding the intake, exhaust, and maybe a ECU. If you have a turbo and changed it out. Have you noticed better or worse gas mileage? Just curious.

Roen

iTrader: (2)

The ECU (fuel management) is the best way to save gas, though, unless you're going to run a standalone, your O2 sensor will override any changes at cruise.

Wizz

I think mine has gone down a little after moding. But it does take more fuel for more power to go faster.