I drive a 2016 Mazda CX9 that gets about 26 mpg at 75 & 80 on I-90 from Seattle to Spokane. 4 cylinder 2.5 L turbocharged gasoline engine in a 4300# SUV. I also drive a Toyota Prius Prime plug-in hybrid that is getting us about 150 mpg...not accounting for the electric miles at about 3 cents per mile, about 25 miles per charge before the gasoline engine needs to run.
"compression ignition in addition to the standard spark ignition to achieve a super lean burn. Coupled with a supercharger," That's getting into a lot of touchy territory. Really easy to get something too hot to destruction if it goes wrong. Just to clarify, the Diesel cycle (from Rudolf Diesel) has the heat of compression of the air in the cylinder sufficient to ignite the fuel injected into the cylinder. The fuel is injected at the correct time and quantity to provide a strong, powerful power stroke. The Otto cycle (from Nikolaus Otto) has the fuel in the cylinder and a spark device at the correct time for the ignition and the strong, powerful power stroke. The Diesel cycle is anything that will burn sufficiently including diesel fuel, propane, other products, black heavy residual fuel oil. The Otto cycle is usually gasoline and sometimes propane and other gases. I've trained at two diesel engine makers. I've run diesel engines to 57,500 hp (straight 12, 2-stroke). Those and 2,700 hp generator diesels ran the heavy black residual fuel oil. They ran fine with this fuel that has up to 3.5% sulfur, which will be illegal after 2020. And, I've run diesel engines as small as hand cranked air cooled engines.
A diesel gets good fuel consumption because the fuel has more BTUs per gallon, and there is not a throttle plate to make the engine work harder pulling air into it. The diesel also has a harder time putting out clean exhaust, as we've seen. Also, gasoline is a cleaner fuel than #2 diesel fuel.
"compression ignition in addition to the standard spark ignition to achieve a super lean burn. Coupled with a supercharger," That's getting into a lot of touchy territory. Really easy to get something too hot to destruction if it goes wrong. Just to clarify, the Diesel cycle (from Rudolf Diesel) has the heat of compression of the air in the cylinder sufficient to ignite the fuel injected into the cylinder. The fuel is injected at the correct time and quantity to provide a strong, powerful power stroke. The Otto cycle (from Nikolaus Otto) has the fuel in the cylinder and a spark device at the correct time for the ignition and the strong, powerful power stroke. The Diesel cycle is anything that will burn sufficiently including diesel fuel, propane, other products, black heavy residual fuel oil. The Otto cycle is usually gasoline and sometimes propane and other gases. I've trained at two diesel engine makers. I've run diesel engines to 57,500 hp (straight 12, 2-stroke). Those and 2,700 hp generator diesels ran the heavy black residual fuel oil. They ran fine with this fuel that has up to 3.5% sulfur, which will be illegal after 2020. And, I've run diesel engines as small as hand cranked air cooled engines.
A diesel gets good fuel consumption because the fuel has more BTUs per gallon, and there is not a throttle plate to make the engine work harder pulling air into it. The diesel also has a harder time putting out clean exhaust, as we've seen. Also, gasoline is a cleaner fuel than #2 diesel fuel.