Because its not a big deal and if the fuel has a problem in every single case I have ever experianced it has not been old unopened fuel but instead it was relatively fresh but undeterminate careless uncapping and unknown exposure to the atmosphere.

Call it what you will, perhaps water or maybe loss of a key component more than the others thru evaporation but it does not really matter it will manifest itself if there is a problem in running problems right on the test stand. A simple test run is not likely to result in the loss of an airplane.

Like many of the others I have made buy outs of folks stuff over the years and that has included large quantities of unopened 'old fuel' and never experianced a single bad gallon of unopened fuel. That has constituted a lot of 'free' flying. So no I don,t mind a little time in carefully checking old fuel and on the type engines I intend to use it with.

John