Someone stated in a post earlier that ice engines have not advanced since the ply duster was sold on the market in 1970. A Japanese company has come out with a 1.5 liter 3 cylinder turbo gas engine that can vary its compression ratio between 8 to 1 and 14 to 1 depending on driving conditions. This engine is rated @ 201 horsepower and mileage is rated at combined 33 mpg. You can order this engine in certain models of Rogue suv's made by this company for 2023 model year. It has been road tested and is has been released to the market and is being manufactured now. I don't know how durable it will be. Seems like engineers working for auto companies realize ice engines are going to be in consumer demand for quite some time with these new technologies coming out for ' old ' engines. Do you think there have been any advancements in ice engine design since 1970 ?