Diesel vs Petrol Car & Ute Breakeven Payback Calculator
Compare fuel efficiency, fuel prices, and purchase price premiums to find your exact breakeven point.
Last reviewed by the myCalculator Editorial Team
Input Parameters
Extra price difference paid for the diesel engine option
Calculation Results
Visual Growth Breakdown
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Formula & How Diesel vs Petrol Car & Ute Breakeven Payback Calculator Works
Diesel engines use less fuel per kilometre but the fuel usually costs more per litre, and diesel versions of a vehicle often cost more to buy. The calculator compares annual fuel cost for each option and divides the extra purchase price by the yearly saving to find the payback period. For example, at 15,000 km a year, a petrol car using 9.0 L/100 km at $1.90 per litre costs 150 × 9.0 × 1.90 = $2,565 a year, while a diesel using 7.0 L/100 km at $2.05 per litre costs 150 × 7.0 × 2.05 = $2,152.50. That saves $412.50 a year, so a $4,000 price premium takes about 9.7 years to repay. Heavy users and tow vehicles reach payback much sooner.
- Enter Annual Driving Distance (km/year) (km): Input your target parameter value.
- Enter Petrol Price ($/Litre) ($/L): Input your target parameter value.
- Enter Diesel Price ($/Litre) ($/L): Input your target parameter value.
- Enter Petrol Vehicle Fuel Consumption (L/100km) (L/100km): Input your target parameter value.
- Enter Diesel Vehicle Fuel Consumption (L/100km) (L/100km): Input your target parameter value.
- Enter Diesel Vehicle Purchase Surcharge ($) ($): Input your target parameter value.
- Apply Formula: Calculate using
Annual Savings = (km/100) × [Petrol_L × $/L_petrol - Diesel_L × $/L_diesel] | Payback Years = Diesel_Premium / Annual_Savings. - Review Results: View exact computed answers, metrics, and worked mathematical proofs.
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Frequently Asked Questions (FAQs)
How much more fuel efficient is diesel compared to petrol?
Modern turbo-diesel engines consume roughly 20% to 30% less fuel (in L/100km) than comparable petrol engines, particularly under highway cruising and heavy towing conditions.
How many kilometers per year make diesel worth it?
In Australia, driving over 15,000 to 20,000 km per year typically achieves a payback on a $3,000–$5,000 diesel purchase premium within 3 to 5 years.
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Calculations and mathematical logic on this page are grounded in published statutory rules, regulatory standards, and official government data published by the following bodies:
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