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The introduction of E85 fuel in India has given rise to a new debate among vehicle owners. As E85 is priced significantly lower than E20 petrol, many drivers assume it is automatically the cheaper option. However, fuel affordability is not determined solely by the price displayed at the pump. The actual cost depends on how far a vehicle can travel on a litre of fuel. Understanding the difference between E20 and E85 is important before deciding which fuel offers better value for money.

 

 

What Are E20 and E85 Fuels?

E20 is a fuel blend consisting of 20% ethanol and 80% petrol. It has become the standard petrol blend across India as part of the country's ethanol-blending programme. Most modern petrol vehicles are designed to run on E20 without major modifications.

 

E85, on the other hand, contains up to 85% ethanol and only 15% petrol. It is intended primarily for flex-fuel vehicles that are specifically engineered to operate on high-ethanol fuel blends. India recently introduced E85 fuel at select outlets to encourage greater use of renewable fuels.

 

The Price Difference

One of the biggest attractions of E85 is its lower retail price. In Delhi, E85 was launched at around Rs82.12 per litre, while E20 petrol costs approximately Rs102.12 per litre. This creates a price gap of nearly Rs20 per litre, making E85 appear much more economical at first glance. The government has intentionally priced E85 lower to promote its adoption and compensate for ethanol's lower energy content.

 

Why Mileage Matters More Than Fuel Price

Although E85 is cheaper per litre, ethanol contains less energy than petrol. As a result, vehicles running on E85 generally consume more fuel to cover the same distance compared to vehicles running on E20 petrol.

 

Consider a simple example:

• A car running on E20 delivers 15 km per litre.

• At Rs102.12 per litre, the running cost is about Rs6.81 per kilometre.

• If the same vehicle experiences a 25% drop in fuel efficiency on E85, mileage falls to around 11.25 km per litre.

• At Rs82.12 per litre, the running cost rises to roughly Rs7.30 per kilometre.

 

This example shows that a lower fuel price does not always guarantee lower running costs.

 

Can E85 Still Be Cheaper?

The answer depends on the vehicle. Modern flex-fuel vehicles are designed to optimize performance on ethanol-rich fuels. If such vehicles manage to maintain relatively good fuel efficiency, E85 could offer competitive or even lower running costs than E20. However, the real-world advantage will vary depending on engine technology, driving conditions, and fuel consumption patterns. For conventional petrol vehicles that are not designed for E85, using the fuel is not recommended and may cause performance or compatibility issues.

 

Environmental Benefits of E85

While the economic advantage of E85 remains vehicle-dependent, the environmental benefits are clearer. Higher ethanol content reduces reliance on fossil fuels and supports India's efforts to lower crude oil imports and promote renewable energy sources. The launch of E85 is part of the government's broader strategy to increase the use of biofuels in transportation.

 

Conclusion

When comparing E20 and E85, the cheapest fuel is not necessarily the one with the lowest pump price. E85 costs less per litre, but its lower energy density often results in reduced mileage. Therefore, the true cost per kilometre depends largely on the vehicle's fuel efficiency. For most current petrol vehicles, E20 remains the more practical option. However, as flex-fuel technology becomes more common in India, E85 could emerge as a cost-effective and environmentally friendly alternative. Before switching fuels, drivers should consider both fuel price and mileage rather than focusing on price alone.