2006 AT Euro, with exhaust mods, K&N filter and brand new tyres. Surprisingly the fuel consumptions been up ever since the new tyres, maybe thats because my wheels are larger now. Best I've got is 11L/100 but this is pure city driving with no highway/freeway whatsoever. I guess this is alright considering im getting 15-16L in the lexus....I've heard that installing coils will improve fuel consumption because less energy is lost to the softer damper/springs while accelerating...is this true?