Valvers are more economical then 8v 2.0's period. If you reckon your getting 42 mpg out of a 8v? I would say your lying.
I have had two eight valves. One in GTi form and my current in cabriolet, and the highest i got from my gti in summer = 35 the lowester 13, the highest in my cab - 39 - lowest 17.
42 from an 8v? lol dont be stupid.
Hey vr6 dude you cant laugh, this is a MPG thread! I would have to remortage my house to afford to take a VR6 to work and back!