I started tracking mileage again once the supercharger went in - prior to the SC, I was getting 12-15 (Hotshot Intake, PV1 Muffler, 87 Octane gas, Tire pressure at 46 lbs). Now I'm running a CAI with Green filter, PV1 Muffler, Supercharger and 93 Octane gas, Tire pressure at 46 lbs).

7/18 12.6
8/5 SC Install
8/15 14.65
9/10 19.897 (roadtrip)
9/27 11.81
11/9 Oil/Filter/PCV change
11/24 18.49 (roadtrip going up)
11/24 17.668 (roadtrip coming back)
12/7 14.24
12/13 15.92
12/19 13.80
12/23 15.56 (roadtrip going up filling 1/2 tank)
12/26 15.44 (roadtrip coming back filling 1/2 tank)
12/27 17.28 (roadtrip next day fill-up)
1/2 16.0

What I've noticed is that during the summer months the mileage is crappy (summer fuel mix), then in the fall it gets really good until it's really cold, then it gets really good again in the spring until the summer fuel mix comes again. Also the mileage starts getting bad towards the end of every other oil change, when I change the PCV and it gets better again. Gassing up the tires give me about 1/2 MPG more, and I think the 93 Octane gives me another 1/2-1 MPG more but it's hard to say with the SC installed). The engine was running towards the hot end with a cone filter pulling engine compartment air - the cold air intake makes the engine run considerable cooler (barely goes above the halfway point, like it did before the SC). When the SC was drawing engine compartment air, the temp always ran just right of center and crept up to "hot" right when running hard or stuck in stop-and-go interestate traffic.

-- John