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Average speed I'm guessing around 60km/h - 70km/h.
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That's pretty high average speed for city driving - for example my avg. speed in city area is about 25-30km/h and I see noticeable difference between "normal" driving and P&G (with lower speeds ratio for P&G is better).
Another thing is mentioned by California98Civic instrumentation - I have only vacuum gauge installed but without this one I bet my results would be worse than now.