Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Makes sense, didnt work for me

This product makes sense. It also makes sense for the chips they talk about for the computer in your car. But the best I was able to get was 1 mpg improvment. Not sure if it was the Tornado or the fact that I tuned it up with new plugs, distributor cap/rotor/spark plug wires, cleaned my K&N air filter as I did them all at the same time. Either way, my MPG was 12/16. Any type of improvement when gas is over $4.00 per gallon was an improvement in my book. I did notice a little better responsiveness in the pedal when in the lower 3 gears. SUV was a 2001 Dodge Durango SLT 5.9 liter 360 engine 4x4. So I guess with what size engine I have the gas mileage was good for improvment to 12/17. Driving style did not change.