The tricky part about using the Insight chart is that lean burn creates that first 215 island, which the Civic doesn't have. However the 250g/kWh point a bit above 80Nm is probably the approximate peak efficiency point at stoichiometric.
That said I wouldn't worry about what rpm to accelerate at; when you accelerate hard at low rpm, the engine is less efficient but the "pulse" takes longer, reducing your car's variation in speed. Just pulse in the top gear, it's easier.
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