Originally Posted by ChrisRT
i just figured a V6 in a lighter car should get better mileage than my 4,200 lb truck with 3.92 gears.
Its not just a v6, its a v6 with a supercharger. All that extra HP made eats up the fuel. However, you could tune the engine/supercharger to give you better gas mileage at the expense of the extra HP.
The compressed air (extra oxygen) can be used to burn the fuel completely to give you better mileage.
OR
Burn more fuel effectively to give you more HP.