FuelEthix
Open Fuel Map
FuelEthix
Open Fuel Map
In India, more drivers are noticing a pattern: as ethanol blending rises in petrol, fuel economy can dip, engine behavior can change, and older vehicles are more likely to show wear or compatibility problems. This page is built to explain those concerns clearly and connect them to the FuelEthix fuel issue database.
Go to FuelEthix View issue mapSource: LocalCircles survey, 44,000+ responses across 305 Indian districts, June 2026.
As ethanol percentage increases, fuel can contain less usable energy per litre. Drivers often report lower km/l, especially after switching to higher ethanol blends or unfamiliar fuel stations.
Higher ethanol blends can lead to slower cold starts, engine knocking, corrosion in older fuel system parts, and a higher risk of breakdowns if a vehicle was not designed for it.
Pumps usually do not show that information clearly. People want a way to estimate what they are actually buying and compare it against reports from other drivers.
The national ethanol blending push has made E20 more common across Indian fuel retail. That has pulled the issue into mainstream attention because drivers are experiencing the effects directly: lower mileage, unexpected maintenance costs, and concern about older vehicle compatibility. Real owner reports on forums like Team-BHP describe drops from around 16-17 km/l to 12-13 km/l on older sedans, and from 17 km/l to under 15 km/l on small hatchbacks, after the switch to higher ethanol blends.
Automakers, including Maruti Suzuki, have said their service records covering over a crore older vehicles show no widespread E20-linked faults, and cite an official 3-3.5% mileage impact — while independent workshop estimates and owner surveys put the real-world figure closer to 4-12%, especially in vehicles built before April 2023 when E20 compatibility became mandatory for new models.
FuelEthix helps turn this growing public concern into an organized, searchable record of the real-world problems people are seeing across different cities and stations.
FuelEthix lets drivers estimate ethanol percentage in petrol and compare it with the real-world effect on mileage and performance.
Drivers can report fuel station issues, mileage loss, engine problems, and other concerns so the database reflects what is actually happening on the ground.
The more reports are collected, the stronger the public understanding becomes around which stations, cities, or fuel types are linked to recurring problems.
We provide the most reliable estimate possible based on available data, but readings may vary by location and pump.
Some modern engines tolerate higher ethanol blends, but older engines are more vulnerable to wear and corrosion.
Current regulations don't require fuel stations to disclose exact ethanol percentages—FuelEthix fills that gap.
E20 is petrol blended with 20% ethanol. India reached its nationwide 20% blending target in 2025-26, and E20 has largely replaced E10 at retail pumps across the country.
Yes. Ethanol has a lower energy density than petrol, so higher blends like E20 typically reduce mileage versus E0 or E5—the exact drop depends on your engine's tuning.
There's no official pump-side disclosure in India, so FuelEthix estimates ethanol percentage using mileage tracking and crowdsourced reports from other owners at the same station.
Higher ethanol content can corrode rubber seals, fuel lines, and metal parts not designed for it—especially in older two-wheelers and cars—leading to starting problems, breakdowns, and reduced engine life.
Tap "Report Issue" on the Fuel Issue Map and submit your location, vehicle type, issue type, severity, and a description—it's added to the crowdsourced map instantly for other users.
Search 800+ Indian cars and bikes for their maximum ethanol blend.
Why E20 fuel reduces mileage and who notices it most.
The full blending roadmap explained.
Hard starts, knocking, and fuel system problems.
60+ sourced government statements, court filings, and media reports.