Quote Originally Posted by Eric SDV6SE View Post
Just do it! I run on U3, sometimes in heavy traffic i take it back to U1 or 2. My fuel economy average is down by about 1.0-1.2l/100km (indicated).

It does transform the car, im loving it
What’s the theory with improved fuel economy? I would have thought it’d be worse if it’s just increasing acceleration and not manipulating the ECU