Gas mileage, ...increase by tuning? Options

[Aracheon]

I did a quick preliminary with no promising results, so, I'll ask the question myself.

Has anyone on here done a quick-and-dirty fuel tune with a piggyback on a stock (or mostly stock) 5SFE and seen a substantial (3+) increase in gas mileage? One of our local Honda tuners did a fuel tune on a stock Honda Civic and saw a huuuge MPG difference after raising the A/F ratios slightly. Understanding that this was done with more than a piggyback - he used Neptune.

But nevertheless, my question still stands... has someone done this with results?

[soulshadow]

Using a bigger 2.25 catback and Magnaflow Muffler The 4age engine deff. eats a lot more and has a lot more HP too. I can spin the wheels like crazy If I rev it high on first gear and then launch. But today when I attached a silencer on to the system. The headers have become really hotter and no matter how high I rev even to red line, the car only spins like wat 1 time and than it takes off. The car is overall slower, cause of the silencer and having more backpressure than the straight flow design when the silencer wasn't on it.