Dave pointed out to me that the increased intake tube size is what makes the info center mis-read from the MAF sensor. It thinks less air is moving past it, so it reads better mpg. I'd say I lost about 4-5mpg adding the S/C, but added at least 20 smilespergallon. So I figure it more than makes up for it.My experience with gas mileage is this, I drove the solstice 2.4 na for 2 years, mileage according to the info center was around 25.5 -26 mpg and I had no problem getting 315-320 miles on a tank full of gas everytime I filled it. Since then, I installed the stage II supercharger,(2 years of summer driving) and the info center still says I get around 25- 25.5, but I have to fill the tank everytime around the 275-280 mark, so I feel that I lost about 30-40 miles per tankful, even though the info center says about the same.