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CAI, exhaust, not sure about the tune or not...but anything that helps the car breathe better will improve the MPG as long as you can keep your foot out of it.
Also, you could try to convince her that you need to lower the car for increased aerodynamics! Lower drag, better mpgs! lol
__________________
1100: 10/13/08
3000: 03/26/09
3300: 05/08/09
3400: 05/12/09
3800: 05/25/09
4200: 05/28/09
5000: 06/09/09
6000: 06/09/09
VIN# A9111943
2SS/RS Black on Black with LS3 and a 6-speed Manual 
15% Window Tint
CAI
StainlessWorks Catback Exhaust
BMR 1.4" lowering springs |