Nitin Gadkari Says Car Owners Can't Check Mileage at Home Amid E20 Petrol Debate

The debate over E20 ethanol-blended petrol has intensified after Union Road Transport Minister Nitin Gadkari said that ordinary car owners cannot accurately check their vehicle's fuel efficiency on their own and should instead rely on tests conducted at authorised dealerships.

His remarks come as motorists across India continue to report lower mileage after the nationwide rollout of E20 petrol.

What did Nitin Gadkari say?

Speaking during an interview with ABP News, Gadkari responded to a journalist who claimed her car's city mileage had dropped from 11 km/litre to 7 km/litre after switching to E20 fuel.

When the journalist said she was relying on the car's dashboard mileage display, Gadkari questioned the accuracy of that method.

He said that vehicle owners cannot accurately determine mileage themselves and that proper fuel-efficiency checks should be carried out using equipment available at manufacturer-authorised dealerships.

Why is the E20 fuel debate growing?

The discussion comes shortly after the Ministry of Petroleum and Natural Gas acknowledged that E20 petrol may reduce fuel economy in some vehicles.

According to the ministry:

• Some vehicles may experience a 3-5% drop in fuel efficiency.
• Mileage is only one factor when evaluating E20 fuel.
• The programme aims to reduce crude oil imports and lower emissions.

The Centre made E20 petrol mandatory nationwide from April 1 as part of India's ethanol blending programme.

Can you accurately measure mileage at home?

Experts say car owners can estimate fuel efficiency reasonably well, although dashboard readings are not perfectly accurate.

Modern vehicles calculate mileage using:

• Fuel injection data
• Distance travelled
• Engine Control Unit (ECU) inputs

Dashboard figures generally remain within 2-5% of manual calculations under normal driving conditions.

The full-tank method

Automotive experts consider the full-tank method the most reliable real-world test.

The process involves:

1. Filling the fuel tank completely.
2. Resetting the trip meter.
3. Driving normally until the next refill.
4. Refilling the tank.
5. Dividing the distance travelled by the litres of fuel added.

This provides a practical estimate of actual fuel efficiency.

What does a dealer's diagnostic machine check?

Manufacturer-authorised diagnostic tools do more than estimate mileage.

They can examine:

• Engine Control Unit (ECU) data
• Fuel injector performance
• Oxygen sensors
• Airflow sensors
• Engine fault codes
• ECU calibration

These systems help identify mechanical or electronic issues that may affect fuel consumption.

However, they do not directly calculate real-world mileage under varying traffic and driving conditions.

What affects a car's mileage?

Fuel economy depends on several factors, including:

• City versus highway driving
• Traffic congestion
• Air-conditioner usage
• Tyre pressure
• Driving habits
• Vehicle load
• Engine condition

Because of these variables, actual mileage often differs from laboratory or manufacturer figures.

Why is the issue significant?

The government's ethanol blending programme is designed to:

• Reduce dependence on imported crude oil.
• Increase ethanol production.
• Lower carbon emissions.
• Improve India's energy security.

However, reports of reduced mileage have prompted concerns among consumers and sections of the automobile industry, leading to renewed debate over E20 fuel performance.

Key Highlights

• Nitin Gadkari said ordinary motorists cannot accurately measure vehicle mileage themselves.
• He advised relying on tests conducted at authorised dealerships.
• The remarks come amid complaints over reduced mileage after the E20 petrol rollout.
• The Centre recently acknowledged that E20 fuel may reduce fuel efficiency by 3-5% in some vehicles.
• Experts say the full-tank method remains the most reliable way to estimate real-world mileage.
• Dealer diagnostic tools primarily identify mechanical issues affecting fuel consumption.

FAQs

Why did Nitin Gadkari say car owners cannot check mileage?

Gadkari said accurate fuel-efficiency testing requires manufacturer-authorised diagnostic equipment rather than dashboard readings alone.

Does E20 petrol reduce mileage?

The government has acknowledged that E20 petrol may reduce fuel economy by around 3-5% in some vehicles, depending on engine compatibility and driving conditions.

How can drivers measure real-world mileage?

Experts recommend the full-tank method, where drivers divide the distance travelled by the litres of fuel consumed after refilling the tank.

What does a dealer's diagnostic machine do?

It checks ECU data, engine health, sensors and other components that can influence fuel consumption, helping identify any mechanical issues.

Why has India introduced E20 petrol?

The ethanol blending programme aims to reduce crude oil imports, improve energy security, support farmers and lower vehicle emissions.