I have an 07 Solstice GXP, I am trying to tune for the best MPG. What is best in terms of the variable valve time tables? For the intake and exhaust cam to be advanced or retarded and to what extent? Also, what about the fuel injection timing? I really do not know how to go about changing the injection angles (timing). I just care about MPG, I know the stock tables try to reduce NOX and aim to get decent MPG and power, but I am making multiple tunes and I do not care for power or NOX (I do not think anyone does) with this one. Mods are in my sig, the car is near stock. Stock tune I get 25-26MPG average if I gun it everywhere, and if I baby it and shift less than like 2300 RPM I get a max of 28. I feel there is a lot more potential than just that. Thanks.