Fuel efficiency technologies

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Start-stop systems Cylinder deactivation Direct injection Low rolling resistance tires

Series vs parallel hybrids: which layout wastes less energy at highway speed? Why does pressing eco mode make a car feel so sluggish? Does a 48-volt mild hybrid system ever pay for itself in fuel savings? Turbo downsizing vs a bigger naturally aspirated engine: which sips less? What is a Miller cycle engine and why do hybrids rely on it? Cylinder deactivation: why does it make some V8s sound odd? 48-volt mild hybrids: what do they add beyond a bigger starter motor? Can a normal petrol engine run on E85 without swapping the fuel system? Variable valve timing and lift: what changes in everyday driving? Coasting in neutral vs engine braking: which saves fuel on a modern car? Electric water pumps and variable oil pumps: real gains or marketing? Do 9-speed and 10-speed automatics really deliver better fuel economy? Do hybrid systems recover energy while coasting or only under braking? Do solar roofs and heat-rejecting glass cut air conditioning load? Cylinder deactivation saves fuel on the highway and almost nothing in town

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