If your keys are hanging in the house as you mentioned, perhaps someone is having some fun with you.
There's more to life than gas mileage
LS3, Whipple, Custom Comp Cam, springs, pushrods, timing set, CAI intake, Apex cold air scoop, Doug Thorley TRI-Y headers, Billet Custom Products baffled Valve covers, Mighty Mouse Catch can, ADM FPCM, ZL1 fuel pump, MSD boost-a-pump, Hex Vent hood vents, ProSport gauges(fuel pressure, AFR, Boost), Corsa, No Cats. Jannetty remote tuned, Pfadt trailing arms, all parts user installed. No Dyno yet. Manual trans. 3.45 gears.