Read the pump before the post
A fuel complaint starts with a receipt, a dispenser label and the exact vehicle—not a screenshot without context.
Good public information should help people ask a better next question.
Record what you bought
Keep the receipt, date, time, outlet, dispenser, fuel grade, litres and odometer reading. If the outlet displays an E20 marker, photograph it with enough context to identify the pump without exposing another person’s private information.
IndianOil’s published marketing guidelines separate E20 from other motor-gasoline grades under the relevant BIS specification and list the characteristics used for testing. The practical lesson is simple: preserve the fuel context before trying to explain an outcome.
Match the fuel to the vehicle
Write down the manufacturer, model, variant, year, fuel system and market. Find the exact owner’s manual or manufacturer response instead of relying on a general internet cutoff.
If a service centre gives verbal advice, ask for the same answer in writing and keep the date. Guidance can be updated, and a source that can be checked later is more useful than memory.
Keep observation separate from cause
Describe what happened: a mileage change, hard starting, a warning light, a smell or a repair. Also note maintenance, weather, traffic, tyre pressure, fuel level and any other change around the same time.
A careful report can show a real observation without claiming that one factor caused it. That distinction protects the owner and makes the public record more credible.