I have a superchip on my car - dont know who did it off had (think it was superchips) but my VR is doing 26mpg around town and 34mpg on a run - couldn't believe it - the car was RR tested at 194bhp with no exhaust or anything beside a k&n panel filter and a superchip. Now my last 2 VR's had full systems, wider throttle bodies, full inductions no cat kiera nelson leads etc etc and the one made 186bhp and the other 191bhp and both only did 24mpg and 29 on a run. So after all this time saying a chip on a VR would be pointless i was wrong lol - she is faster and more efficiant. I'll have mine