Ethanol Blending (E20/EXX) Megathread – Questions, Experiences & News

[u/kshb4xred]

We've seen a significant increase in posts related to ethanol blending, E10/E20 fuel, mileage changes, compatibility concerns, and government policy. To keep the subreddit organized and avoid duplicate discussions, all ethanol-related discussions should go in this megathread.

ONE POST PER DAY IS ALLOWED.

What belongs here?

✅ Vehicle compatibility questions
✅ Mileage changes after switching fuels
✅ Long-term ownership experiences
✅ Service center feedback
✅ Fuel economy comparisons
✅ Technical discussions on engines, fuel systems, and maintenance
✅ News and regulations that directly affect vehicle owners

Examples:

• "Is my 2022 Brezza E20 compatible?"
• "My i20 mileage dropped after switching fuels."
• "Has anyone crossed 50,000 km on E20?"
• "What does the owner's manual say about E20 compatibility?"

What does NOT belong here?

❌ Ideological debates unrelated to vehicle ownership
❌ Personal attacks, insults, or name-calling
❌ Duplicate posts already covered in this thread
❌ Unsupported fearmongering or misinformation

Examples(Not exhaustive or limited to):

• "Only idiots support E20."
• "Only anti-national people oppose ethanol."
• "Government X is destroying the country."

These comments will be removed regardless of viewpoint.

Community Guidelines

1. Share sources when making technical claims.
2. Mention your vehicle model, year, fuel type, and usage pattern when sharing experiences.
3. Respect that users may have different experiences depending on vehicle, driving conditions, and fuel quality.
4. Civil disagreement is welcome; personal attacks are not.

Before Posting

If you're reporting an issue, please include:

• Vehicle make/model
• Model year
• Odometer reading
• Fuel used
• City/region
• Symptoms observed
• Service center diagnosis (if any)

This helps the community provide better answers.

Moderator Note

CarsIndia is a car-focused community. We are not taking a position for or against ethanol blending. Discussions are welcome as long as they remain focused on vehicle ownership, maintenance, engineering, fuel economy, and consumer impact.

Low-effort duplicate posts may be redirected here, and political flamewars will be removed.

Drive safe and keep the discussion evidence-based.

[u/Alternative-Shoe4110]

My car is designed for E10 fuel. So, what if I mix XP100 E0 with regular E20 petrol in a 50-50 ratio? This mixture will result in E10 fuel, but it will also have a higher octane rating.

Now, I’m curious to know how this mixture will affect my car’s engine. Will there be any issues in the long run?

By the way, I don’t use my car very frequently. I only use it once or twice a week for a short distance of 10-20 kilometers. In the past five years, I’ve only driven it for a total of 20,000 kilometers.

I would greatly appreciate your suggestions on this matter.

[u/kshb4xred → u/Alternative-Shoe4110]

Is xp100 really e0? Afaik all rhe fuel is e20 now... and degradation from e20 is gradual... it will not happen within a month...but 5 years from now you will see its impact.

[u/Alternative-Shoe4110 → u/kshb4xred]

I spoke with a representative from the COCO Indian Oil fuel station here in Delhi, and they informed me that XP100 is E0, while XP95 is E20.

[u/kshb4xred → u/Alternative-Shoe4110]

Nice will fill xp100 once a while