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?
In: 85
Higher compression = better mileage and power
Better breathing, that is larger valves or valves per cylinder to fully exchange burned exhaust with fresh intake air.
Fewer restrictions is intake manifold and either turbocharging or supercharging brings in a more complete intake charge of air.
Transmission settings along with final drive ratio to allow engine to cruise at maximum power RPM. This may mean less power.
More transmission gears so the engine sits at the maximum power RPM over a wider range of car speeds.
Less weight in the car. Plastic or aluminum used in place of steel. Even mini-spare tire over a full-size spare.
Be aware ‘more fuel efficient’ is a marketing term. Nobody states in comparison to what. Same model care 10 yrs earlier? Other cars in same class? Smaller model than other models?
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