When accelerating, I like to keep the engine between 1750 and 2250rpm, and accelerate at around 80% load (which is around the point which assist begins), because that's the range where the engine is most efficient:
If this car didn't have lean burn, pulse and glide would provide a lot more benefit over cruising than it does. Pulse and glide at peak BSFC is still the most efficient way to drive, but lean burn allows the Insight to cruise at a steady speed with a lot less parasitic loss.