Of course you have to keep your foot out of it to get the mpg boost
If you dont the mileage will go the other way
The vortech is the same way, but not quite as much as that mileage. On the Highway, where you are only cruising, the mileage is better than stock, but around town it is a little less. I used to get about 280/tank mixed driving, now it is around 240-250. On the highway I can get about 300, if I take it easy.
