Ethanol or gasoline (flex fuel)

Ethanol or gasoline (flex fuel): what it is for

The calculator shows whether it is better to fill a flex-fuel car with ethanol or gasoline. The general rule is: if ethanol costs up to 70% of the price of gasoline, it pays off.

You can adjust the percentage according to your car's real mileage.

How to use

1. Type the price of ethanol and gasoline.
2. Adjust your car's ethanol mileage, if you know it.
3. See which fuel pays off.

When to use it

• Deciding at the pump.
• Saving money every month.
• Checking a flex-fuel car's mileage.

Frequently asked questions

Why 70%?

On average, ethanol gets about 70% of the mileage of gasoline. If your car does better or worse than that, adjust the slider with data from the manual or your real fuel economy.

Is it really free?

Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 tools are free and run right in your browser.

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