Autocar India’s lab tests confirm that 100-octane petrol contains no ethanol, while all other fuels have 20 percent. Tap to ...

87 octane gasoline, often called "regular" gas, is one of the most commonly used fuels in the United States. But what gives it that 87 rating is a word you've probably heard a time or two: Ethanol.

Your car's computer detects wrong octane fuel and automatically adjusts to prevent engine damage, though performance drops until you refuel correctly.

The Pennsylvania House passed, and sent to the Senate, legislation that would authorize inspectors to begin random testing of octane levels in gasoline. Senator Stewart Greenleaf (R-Bucks/Montgomery) ...