When it’s time to refuel, the doubt comes up again: gasoline or ethanol? The decision changes depending on price, the car’s consumption, and even the time of year.
Below are short answers to the questions that most often come up in everyday life, with a focus on Brazil and on what really matters at the pump.
Does the 70% rule still work?
It works as a shortcut, not as a law. If the price of ethanol is up to about 70% of the price of gasoline, it tends to be worth it. That’s because, on average, ethanol delivers fewer kilometers per liter.
When to adjust the calculation
- Newer, well-tuned cars may perform better on ethanol. - In heavy urban use (traffic, air conditioning), the consumption difference can increase. - Ideally, observe your car’s real consumption over a few tanks.
My car is flex. Can I mix the two?
Yes. Mixing happens naturally when you alternate fuels. The car’s system adapts.
- There is no mechanical problem with mixing. - Cold starts in older models may vary depending on the proportion.
Does ethanol wear out the engine more?
No. Ethanol is a clean fuel and burns efficiently. What wears out an engine is poor maintenance, out-of-spec fuel, and severe use without care.
- Changing the oil on schedule matters more than the choice of fuel. - Keeping the fuel filter up to date helps avoid headaches.
Does gasoline really go further?
Yes, in kilometers per liter. Gasoline has higher energy density.
- On the highway, the difference is usually clearer. - In the city, driving style has a big influence.
Why does the price of ethanol change so much?
Ethanol depends on the sugarcane harvest, the climate, and regional logistics.
Factors that affect the price
- Sugarcane harvest and off-season. - Rain or drought affecting production. - Transportation costs to gas stations.
Because of this, ethanol can be competitive one month and lose ground the next.
Gasoline has ethanol mixed in. Does that change the calculation?
A little. Gasoline sold in Brazil already comes with anhydrous ethanol in the mandatory blend.
- This blend helps with octane rating and emissions. - It also makes gasoline’s efficiency vary slightly over time.
And what about environmental impact, does it count in the choice?
For many people, yes. Ethanol has a renewable origin and, over its full cycle, tends to emit fewer greenhouse gases.
- In producing regions, the logistical impact is smaller. - In practice, the environmental factor usually weighs in alongside price.
So, which one should I choose today?
Use a simple criterion:
- Compare prices at the pump. - Observe your car’s real consumption. - Consider the type of use (city or highway).
The right choice is the one that makes sense for your wallet and for your vehicle’s routine at that moment.
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