Tyre Size Fuel Consumption Calculator (Australia)

Tyre Size Fuel Consumption Equation:

\[ \Delta FE = FE \times f(\Delta R) \]

Change in Fuel Efficiency (ΔFE):

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1. What is the Tyre Size Fuel Consumption Equation?

The Tyre Size Fuel Consumption Equation estimates the change in fuel efficiency due to changes in tyre size. It helps vehicle owners understand how modifications to tyre radius can affect their vehicle's fuel consumption performance.

2. How Does the Calculator Work?

The calculator uses the equation:

\[ \Delta FE = FE \times f(\Delta R) \]

Where:

\( \Delta FE \) — Change in fuel efficiency (km/L)
\( FE \) — Original fuel efficiency (km/L)
\( \Delta R \) — Change in tyre radius (%)
\( f(\Delta R) \) — Function approximating the effect of radius change

Explanation: The equation accounts for how changes in tyre radius affect the vehicle's effective gearing and subsequently its fuel efficiency.

3. Importance of Tyre Size on Fuel Consumption

Details: Tyre size modifications can significantly impact fuel efficiency. Larger tyres may decrease fuel efficiency due to increased rolling resistance and altered gearing ratios, while proper tyre sizing maintains optimal vehicle performance.

4. Using the Calculator

Tips: Enter original fuel efficiency in km/L and the percentage change in tyre radius. Positive values indicate larger tyres, negative values indicate smaller tyres.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: This provides an approximation. Actual results may vary based on vehicle type, driving conditions, and other factors.

Q2: What is considered a significant tyre size change?
A: Changes beyond ±3% are generally considered significant and may require speedometer recalibration.

Q3: Do larger tyres always decrease fuel efficiency?
A: While larger tyres typically decrease fuel efficiency due to increased weight and rolling resistance, the actual impact depends on multiple factors including tyre composition and driving patterns.

Q4: Should I consider other factors when changing tyre size?
A: Yes, consider clearance issues, speedometer accuracy, handling characteristics, and potential warranty implications.

Q5: Is this calculator specific to Australian conditions?
A: While the calculation principles are universal, the results are presented in metric units commonly used in Australia.