The Transportation Efficiency Index (TEI 5.0) is my personal view on how the efficiency of cars should be measured today, it is a better approach to measuring and comparing vehicle efficiency beyond traditional metrics.
By considering multiple factors including weight, power, capacity, and aerodynamics, the TEI provides a holistic view of how efficiently vehicles utilise resources and space.
The Transportation Efficiency Index is based on my personal hypothesis that efficiency is more than just energy consumption and speed. It evaluates vehicles using multiple factors to provide a comprehensive efficiency score that goes beyond traditional metrics like litres per 100 km or kWh per 100 km.
The TEI 5.0 formula considers several key vehicle characteristics:
These factors are weighted and combined to create a single score that represents overall transportation efficiency.
TEI 5.0 Formula:
TEI =
(weight / (seats × horsepower)) ← base load per unit power per person
+ (weight × horsepower / 100,000) ← penalty excess combined mass and power
+ (tire_width × Cd / 10) ← aerodynamic and friction penalty
+ (energy_consumption / 10) ← real-world energy use
+ (weight² / 1,000,000) ← material impact penalty (exponential)
+ (battery_penalty) ← applied only if EV (weight / 500)
TEI scores range from 0 to 100, where higher scores indicate better efficiency:
The score allows for direct comparison between different vehicle types, including those with different energy sources.
| Brand | Model | Weight (kg) | Horsepower | Seats | Tire Width (cm) | Cd | Energy Type | Consumption | TEI 5.0 Score |
|---|---|---|---|---|---|---|---|---|---|
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