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Dear All Experts, This has been discussed under several topics and this is a continuation to the feedback provided by Rumesh, back in 2016 June. ☺️. Hope you can remember it. I thought of shifting this to a new topic since it was under a topic not relevant to the content. This was your feedback This is some addition to what you have replied above. Other than the lower compression ratio (delayed intake valve closure thus less compression) following video explains the modern Atkinson engines use higher expansion ratio after the combustion, creates less pressure in the cylinder during exhaust. Technically both compression and exhaust strokes are extracting lower power from the engine during its compression and expelling cycles. This offers a better fuel efficiency. But it is under powered compared to Otto cycle engines. Further to that, you mentioned that " Expelled portion of gas mixture is sucked into the next piston on suction stroke while ECU makes necessary adjustments in EFI to take the expelled gas mixture into account.", is there a big advantage of sucking the expelled gas back into the next cylinder ? Aren't these expelled gases contain very high amounts of CO2 , which reduces the efficiency of the firing ? However, I agree with you the point that engine saves power by utilizing the pressure from the expelled gas to filling the cylinder in inlet stroke.