Calculate and track vehicle fuel efficiency over time.
Understanding fuel efficiency measurement and optimization. Fuel efficiency: distance traveled per unit fuel consumed—higher efficiency better. Measurement standards: l/100km (metric), mpg (imperial, US or UK). Calculation: fuel consumed ÷ distance × 100 = l/100km. Example: 40 liters fuel, 600km drive = (40 ÷ 600) × 100 = 6.67 l/100km. Real-world vs. rated efficiency: manufacturers rate optimistic conditions (steady speed, optimal conditions), real-world 15-25% lower. Testing cycles: WLTP (Worldwide Harmonized Light Vehicle Test Procedure) relatively realistic, older cycles overestimated consumption.
Factors affecting efficiency: engine size (larger engines generally less efficient), vehicle weight (lightweight vehicles more efficient), aerodynamics (sleek shapes better), drivetrain (front-wheel vs. all-wheel drive, FWD more efficient). Engine efficiency: combustion efficiency, heat loss, mechanical friction all affect consumption. Transmission: manual typically more efficient than automatic (though modern automatics narrowed gap), CVT (continuously variable) smooth delivery. Hybrid efficiency: electric motor supplements gas engine, reduces gas consumption 20-50% depending on driving. Electric vehicle efficiency: no fuel consumption, electricity usage varies by battery size, driving style. Plug-in hybrid: electric-only mode for short trips (common commutes), gas backup for long distance. Driver behavior impact: aggressive acceleration increases consumption 5-10%, speeding increases consumption 7% per 5kph above 80kph.
Route planning: avoiding traffic, smooth driving routes improves efficiency. Maintenance: regular servicing maintains efficiency (spark plugs, fuel injectors, oil viscosity). Tire pressure: each 1psi below recommended increases consumption ~0.3%. Vehicle load: extra weight decreases efficiency (approximately 5% per 45kg added). Tracking consumption: recording fuel fill-ups enables efficiency trend monitoring. Dashboard displays: trip computers show real-time and average consumption enabling driver adjustment. Hypermiling: extreme efficiency techniques (coasting, reduced acceleration) increase efficiency but reduce safety. Understanding fuel efficiency enables vehicle selection, driving optimization, cost reduction, environmental impact minimization..