Average Car Owner Can't Verify Mileage Accurately, Says Nitin Gadkari Amid E20 Fuel Debate
India's push towards cleaner transport has once again come under the spotlight after Union Road Transport and Highways Minister Nitin Gadkari addressed growing concerns over vehicle mileage on E20 petrol. Responding to complaints from motorists, the minister said that the average car owner cannot accurately measure fuel efficiency on their own and should instead rely on mileage tests conducted by authorised dealerships using standardised procedures.
The remarks come at a time when the government's ethanol blending programme is expanding across the country, with E20 petrol—containing 20% ethanol and 80% petrol—becoming increasingly available at fuel stations. While the initiative is aimed at reducing India's dependence on imported crude oil and cutting emissions, some vehicle owners have claimed that their cars deliver lower mileage after switching to E20 fuel.
The debate has sparked discussions among consumers, automakers, fuel retailers, and policy experts over how fuel efficiency should be measured and whether motorists have enough information about ethanol-blended fuels.
What Did Nitin Gadkari Say?
Addressing concerns raised over fuel efficiency, Gadkari stated that individual drivers cannot reliably calculate vehicle mileage because everyday driving conditions vary significantly. According to the minister, factors such as traffic congestion, road quality, tyre pressure, weather, driving habits, vehicle maintenance, and load carried in the vehicle all affect fuel consumption.
He said that mileage should be assessed through standard testing methods carried out by authorised dealers or under certified conditions rather than through manual calculations based on fuel refills.
His comments were aimed at addressing complaints that have surfaced since E20 petrol became more widely available in India.
Why Is E20 Petrol Facing Criticism?
Many motorists have reported that their vehicles appear to travel fewer kilometres per litre after using E20 petrol. Social media platforms and automobile forums have seen an increase in discussions where drivers compare mileage figures before and after the transition.
One reason behind these concerns is the difference in energy content between petrol and ethanol.
Ethanol contains less energy per litre than conventional petrol. Because of this, engines may consume slightly more fuel to produce the same amount of power, potentially leading to a small reduction in fuel economy depending on the vehicle.
However, the actual impact varies widely. Modern engines designed or calibrated for ethanol blends may experience only a marginal change, while older vehicles could notice a greater difference.
Understanding India's Ethanol Blending Programme
India has been steadily increasing ethanol blending as part of its broader energy and environmental strategy.
The government has promoted ethanol-blended fuel to:
Reduce dependence on imported crude oil.
Lower greenhouse gas emissions.
Support domestic sugarcane and grain farmers.
Improve the country's energy security.
Create additional income opportunities for ethanol producers.
The original target of achieving 20% ethanol blending by 2025 has accelerated investment in ethanol production and fuel distribution infrastructure across the country.
Today, E20 petrol is available at an increasing number of fuel stations, and automobile manufacturers have begun introducing vehicles that are compatible with higher ethanol blends.
Can Drivers Measure Mileage at Home?
Many drivers calculate mileage using the "tank-to-tank" method—filling the fuel tank, recording the odometer reading, driving until the next refill, and dividing the distance travelled by the amount of fuel added.
While this method provides a rough estimate, experts note that it is not a laboratory-grade measurement.
Fuel economy can vary because of several factors, including:
City versus highway driving.
Stop-and-go traffic.
Air conditioner usage.
Vehicle load.
Driving speed.
Engine condition.
Tyre inflation.
Fuel quality.
Even using the same vehicle on the same route can produce different mileage results on different days.
This is the basis for Gadkari's argument that standardised testing provides a more reliable comparison than individual calculations.
What Do Automakers Say?
Several automobile manufacturers have already developed engines capable of operating efficiently on E20 petrol. Many new vehicles sold in India are now designed to be E20-compatible, while older models may require owners to check manufacturer recommendations before using higher ethanol blends regularly.
Automakers generally certify fuel efficiency through controlled testing conducted under prescribed conditions. These tests are intended to provide comparable figures across different vehicle models, although real-world mileage often differs from official ratings.
Manufacturers also advise owners to maintain proper tyre pressure, service vehicles regularly, and use recommended engine oils to achieve the best possible fuel efficiency.
Why Fuel Economy Matters for Consumers
For many Indian households, fuel expenses represent a significant share of monthly transportation costs. Even a small change in mileage can affect running costs over time, especially for people who drive long distances every day.
This is why reports of lower fuel efficiency have attracted attention among commuters, taxi operators, delivery drivers, and fleet owners.
Consumers are increasingly seeking clarity on whether any reduction in mileage is offset by the broader economic and environmental benefits of ethanol blending.
The Environmental and Economic Perspective
Supporters of ethanol blending argue that the programme delivers benefits beyond individual fuel economy.
Higher ethanol blending can help reduce fossil fuel consumption, lower carbon emissions, and strengthen India's energy independence by reducing crude oil imports. It also creates demand for agricultural feedstocks such as sugarcane and maize, providing additional income opportunities for farmers and supporting rural industries.
At the same time, experts emphasise that continued investment in vehicle technology, engine calibration, and fuel infrastructure will be important to maximise the benefits of ethanol-blended fuels while minimising any impact on performance or efficiency.
What Happens Next?
As E20 petrol becomes more common nationwide, discussions are likely to continue around fuel economy, vehicle compatibility, and consumer awareness. Industry experts expect automakers to further optimise engines for higher ethanol blends, while government agencies may continue public outreach to explain how ethanol-blended fuels affect vehicle performance.
For motorists, the key takeaway is that real-world mileage depends on multiple variables, not fuel alone. Drivers concerned about fuel efficiency should follow manufacturer recommendations, maintain their vehicles properly, and compare mileage over longer periods rather than relying on a single tank of fuel.
The Bottom Line
Nitin Gadkari's comments have reignited the conversation around E20 petrol and fuel efficiency in India. While the minister argues that average car owners cannot accurately verify mileage without standardised testing, consumer concerns about running costs remain an important part of the debate.
As India moves ahead with its ethanol blending programme, balancing environmental goals, energy security, and consumer confidence will remain essential. For vehicle owners, understanding how fuel economy is measured—and the many factors that influence it—will be just as important as the fuel they choose to fill in their tanks.
