I recently purchased by 7th first gen Insight and it's a bit unusual. I'm not complaining....the car goes into lean burn easier than any of the the others I've had and holds it there much longer. I can be using cruise and hit a slight incline and it still stays in lean burn. The result is the MPG is a dozen higher than any of my previous 5 speeds. It has the typical potenza's and runs the same as the rest....any idea why a car would hold lean burn so well?