My motivation is not necessarily mpg (although I will take it) or acceleration (although I will take it) but driving at nearly 4000rpm on the highway (yes, some of us do) just isn't enjoyable especially for longer than a half hour. Plus it will extend the life of my engine. You have to look at the overall package and not just what the fuel savings are.
Better acceleration Better fuel economy Engine longevity Comfort on highway driving for extended periods
