Assuming everything else is equal (vehicle size, weight, driving style, tires), how do you make ICE engines be more fuel efficient? I noticed my dad’s 1996 Nissan Pathfinder V6 consumes 13L/100km (mixed driving) while a newer V6 is 9L/100km. Car manufacturers claim their engines are “more fuel efficient”, how do they accomplish that?
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Newer Pathfinder has a 9 speed transmission and direct injection. Those two things alone will make a big difference.
Manufacturers have been throwing a lot of money at getting fuel efficiency as it is much more important to the consumer than say 25 years ago as well as regulations Lots of little tiny incremental changes. For example switching from 5W30 oil to 0W20 gets you a tiny bit of mileage. Do a lot of such changes and it adds up. Down side is there more stringent emissions standards.
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