Stock sounds about right, on my 2013 I've rarely hit more than 21mpg. Now, with my mods I went down to an avg of 18.5/18.8 (stating from the onboard system).
__________________
2013 PW 370Z Touring+Sport, NAV
Tint 35% side, 18% back | RJM clutch pedal | ZSpeed SS lines | Stillen Gen3 CAI | Fast Intentions HFC and TDX 12'' CF CBE | UpRev
|