AWC, I agree in some respects to MPG not being too important. We all make choices on our driving habits. I can look at my fuel log and see the results of tradeoffs I've made when driving.
If something important comes up and I'm pressed for time {or the wife is
really anxious to get somewhere} my mileage suffers. Just about a week and a half ago, I found myself just ahead of a large tornado coming my way. When I realized how close it was, I can assure you, MPG became the last of my concerns.
FWIW, I do find the process of trying for the best MPG to be worth it or I wouldn't do it. I like the challenge of trying to beat my average as I try to improve. I can also say that my driving is far less stressful now that time travelled, or speed through a curve is no longer my top priority. I don't flinch and automatically hit the brakes any more when I meet a police cruiser. I hope you give it a fair try before you dismiss it as not worth your time. But if you choose to disregard this driving style, you are free to do that too.