Has anyone had any experience with one of those modules that says it will increase fuel mileage? Been looking at the one from g-force. Don't really care about the h.p. Increase. Hardly ever get out of third anyway. Don't know anybody that has ever used any of them before. Don't want to waste the money for nothing, better used in gas tank.

 

If you're referring to one of those piggyback modules, don't even bother. Nissan tuned the VQ pretty well and the aftermarket modules just don't work. Do a little searching and you'll find UpRev has the most effective tuning system available for reflashing our ECMs. Event then, the performance gains don't usually include significant MPG increases.