Didn't I hear somewhere that shifting into neutral gear when you go downhill saves gas? (If so, why didn't I hear that it makes the computer go kerfluey in a car with automatic transmission...or DID it?) My 2007 Corolla's computer had to be replaced after weird death-gasps, and I'm wondering if I hastened it to an untimely demise by coasting down the hills and dales. I made it all the way from the Green Mountains down to Massachusetts in neutral (well, almost). I'm sure an NPR listener offered this as a "green tip." No?