I was told by Innovative
Diesel that the economy tune would gain 2-4 MPG.
The street tune would gain 1-2 MPG.
They hold back the fuel with the economy tune, so it makes less power.
I used to run the economy tune. My truck ran well.
I raced an F-150 and barely beat him, so I decided to run the street program.
Holy crap!, with the street program my truck screams now! I'd smoke that same truck with the street program!!
There is so much power, I don't really go past 3/4 throttle much. If you floor it, make sure you are going straight and the pavement is dry, or you'll be sideways in a heartbeat!
Hope that helps. If you drive easy you'll see an improvement in MPG. I gained about 1 MPG. I run it hard at least once a day to keep the carbon blown out.:smoke