ur 11 model may be right on in the stock form... put a box on it and it will lie to you i can promise you that
the box increases fuel rail pressure and tweaks the timing then all the sudden your pcm thinks its getting 23 mpg because the fancy mpg deal is set up with the factory parameters. the ecm thinks it is getting great mileage because the motor IS running better (more HP/TQ with less rpm) but it doesnt know about the extra fuel getting dumped or extra timing to achieve this due to the smarty or what ever box you are using increasing the rail pressure and timing. just my two pennies!!!!
BTW rolling coal and fuel economy DO NOT go together....
but rolling coal sure is fun
