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As poomanchu mentioned, the costs are surely to outweigh the benefits. I think we all agree that an increase can be had with a tune, either via a flash or stand alone.
Let's look at the payback: 30 to 31.5 increase in mileage (5%). With gas at $3.50 and the tune/equipment cost of $500 (which is probably unlikely to be this cheap) you are looking at a payback of 90,000 miles. If it cost $1,000, it would take 180,000 miles. That is a very long time for a payback.
Even with a 10% increase with the above variables, you'd be looking at a 47,100 miles for a project cost of $500. 47,000 miles is 2-3+ years of driving.
Now, if you had a fleet of the same vehicle, a reduced rate for tuning costs and a discounted equipment cost, then it might be worth the time.
Then again, if you want to pay for it just to experiment, then the payback cost is out the window since personal reasons overcame the cost.
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