Modern gasoline engines are supposedly 25% efficient the remaining 75% lost as heat. Modern turbo-diesel engines are again supposedly 50% efficient with the oth

Modern gasoline engines are supposedly 25% efficient the remaining 75% lost as heat. Modern turbo-diesel engines are again supposedly 50% efficient with the other 50% heat loss. I don't have specific stats just what I've heard over the years. Not to be antagonistic but what gasoline engines which are not a hybrid get (US or Imperial) 50 to 60mpg? I could see diesel engine vehicle average mileage for small manual transmission getting high Imperial 60mpg gas maybe high 40s mpg. Deep water and gasoline engine don't tend to work well, and in my region snow gets under the hood then melts (can't get it all out) which causes problems. Compared to a gas engine a diesel engine will run underwater if it has air you see 4x4 trucks with snorkels on the A-pillar (and some other sealing) in Africa countries, Australia and military use too.