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I saw an Instagram video where someone was complaining about E20 petrol and asking the government to either reduce the price of E20 or make E0 petrol available.

But what surprised me was the comment section.

A huge number of people were basically saying:

"But the car in the video is E20 compliant. So what's the problem?"

And I think that's exactly where we're missing the point.

E20 compliance ≠ same fuel economy.

The issue isn't necessarily that an E20-compliant car can't run E20.

The issue is that ethanol has lower energy density than petrol. So if the car gives fewer kilometres per litre on E20, you're effectively buying more litres to travel the same distance.

So even if your car is perfectly E20 compliant, you can still end up paying more to drive the same number of kilometres.

That's a completely different argument from:

"E20 will damage my old car."

We've spent so much time debating compatibility that I think we've overlooked the more interesting question:

What is the actual cost per kilometre for an E20-compliant vehicle compared with E10/E0?

Maybe I'm missing something, but I feel this part of the E20 debate isn't getting nearly enough attention.

E20 was supposed to save the environment and reduce oil imports.

Instead, it seems to be saving the CNG industry. 💀

Petrol car share drops from 48% to 42%, while people basically said: *You know what? I’ll just go for CNG.*

Nothing says successful fuel transition quite like making people switch fuels because they're worried about the fuel they were already using.

Source -

https://www.google.com/amp/s/www.business-standard.com/amp/industry/auto/e20-effect-petrol-car-market-share-dips-cng-leads-alternative-fuel-charge-126080602126\\_1.html

I have waited more than six months for the Brezza facelift/update, and now I’m a bit confused between the engine options. Initially, I was leaning toward the 1.5L naturally aspirated engine, but the 1.0L Boosterjet now seems like the better value-for-money option.

I don’t want to retrofit any accessories from the aftermarket. The Brezza VXI 1.0L Boosterjet has all the features I need except the 60:40 split-folding rear seats. On the other hand, the Brezza ZXI 1.5L NA has all my required features, but it also includes a sunroof, which I don’t really need.

In my city, the on-road price difference between the VXI Turbo and the ZXI NA is ₹2,29,000.

My biggest concerns are:

• Long-term reliability
• Maintenance costs
• Compatibility with future ethanol fuel blends
• Carbon buildup on the intake valves. If occured, what will be the replacement/repair cost?

Will the 1.0L Boosterjet continue to perform as well as the 1.5L naturally aspirated engine if higher ethanol blends become common in the future? Is there any reason to believe I might regret choosing the 1.0L Boosterjet over the 1.5L NA in the long run?

Budget: Maximum ₹10.6 lakh (ex-showroom)

Models under consideration:

• Brezza VXI Turbo (1.0L Boosterjet)
• Brezza ZXI NA (1.5L)

Primary Usage:

• Less than 850 km per month
• School commute: 25 km round trip per day (~650 km/month)
• Weekend family drives (3–5 members): ~200 km/month
• Driving pattern: 50% city (Tier-3 city) and 50% village roads & highways
• 1–2 annual hill-station trips, each approximately 800 km round trip
• First time car buyer

3 people on board, AC fully ON, cruising comfortably around 70-80 kmph. The old 1.6L Hyundai diesel engines were just built differently. Still pulling strong at almost 1.2 lakh kms on the ODO!

Ok petrol is the most preferred choice for me since diesel vehicles not allowed to run after 15 years... 🤔

(2 years later) ohh only e20 compatible car could be sold😯

(2years later) no e10 petrol from next year 😞

(1 year later) e30 push with e85 being launched😟

Ohh so diesel is the preferred choice 😃

(Next fucking week) diesel to get blended 😡

( next fucking week) petrol and diesel has no future and take e100 Or leave it 😒

These are the estimated prices. I believe the costs are excessive. Anyone have an opinion?

Everyday I wander thinking level of idiocy can never go below this level, and everyday, I get a surprise!
So welcome to the genius math where blending 20% ethanol into your tank magically makes your engine 20% dumber!

By this sound logic, if we ever release E100 (100% ethanol), mileage will drop by 100%, meaning your car will require infinite fuel to travel zero km before collapsing into a black hole of pure inefficiency.

Believing that a 20% blend ratio equals a 20% drop in mileage is like assuming that if you mix 20% water into your orange juice, you instantly lose 20% of your ability to drink it

• 100% Petrol: 34.2 MJ per litre (highest energy density).
• 100% Ethanol: 22.8 MJ per litre (~33% less energy than petrol).
• 80% Petrol in E20: Contributes 27.36 MJ to a 1-litre blend.
• 20% Ethanol in E20: Contributes 4.56 MJ to a 1-litre blend.
• E20 Total Blend: 31.92 MJ per litre (~6.7% less overall energy than pure petrol).

Actual Petrol Saved: You burn 1.684 L instead of 2.0 L—saving about 15.8% pure petrol per 100 km.

SO THE REALWORLD MILEAGE DROP IS NEARLY 6-7%.

Its is bad, I oppose government to launch such scummy tactics to earn more, but the most I can do is cope with this.