guys this is odd. i used to get around 12.5-13 L/100km (yes metric, i'm in canada). recently i installed both crawford plenum and an invidia g200 exhaust and i'm seeing about 11.1-11.5 L/100km. fairly significant change here. i expected to have worse milage after these mods -- the only other thing i changed was that i put the front tire pressures to around 34psi and the rears to around 36psi (just playing aruond with tire pressure for undresteer + oversteer characteristics); before the tire pressures were around 35psi all around.

tire pressure affects some fuel economy but not this much.. (?) is this a normal behaviour for these mods? is my car leaning out or something?

with the mods, i do feel i'm driving more aggressive too -- so again, i should get worse milage...

 

Nevermind, I see now.